6420532500 has 240 divisors, whose sum is σ = 21101745280. Its totient is φ = 1687392000.

The previous prime is 6420532457. The next prime is 6420532507. The reversal of 6420532500 is 52350246.

6420532500 is a `hidden beast` number, since 64 + 20 + 532 + 50 + 0 = 666.

It is a super-3 number, since 3×6420532500³ (a number of 30 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420532507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4926849 + ... + 4928151.

Almost surely, 2^6420532500 is an apocalyptic number.

6420532500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6420532500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10550872640).

6420532500 is an abundant number, since it is smaller than the sum of its proper divisors (14681212780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6420532500 is a wasteful number, since it uses less digits than its factorization.

6420532500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409 (or 1386 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

The square root of 6420532500 is about 80128.2253641000. The cubic root of 6420532500 is about 1858.6189019120.

Adding to 6420532500 its reverse (52350246), we get a palindrome (6472882746).

The spelling of 6420532500 in words is "six billion, four hundred twenty million, five hundred thirty-two thousand, five hundred".