620000640 has 192 divisors, whose sum is σ = 2446947360. Its totient is φ = 141705216.

The previous prime is 620000639. The next prime is 620000663. The reversal of 620000640 is 46000026.

620000640 is a `hidden beast` number, since 6 + 20 + 0 + 0 + 0 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32632 + ... + 48008.

Almost surely, 2^620000640 is an apocalyptic number.

620000640 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 620000640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1223473680).

620000640 is an abundant number, since it is smaller than the sum of its proper divisors (1826946720).

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

620000640 is a wasteful number, since it uses less digits than its factorization.

620000640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15409 (or 15394 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 620000640 is about 24899.8120474834. The cubic root of 620000640 is about 852.7021917309.

Adding to 620000640 its reverse (46000026), we get a palindrome (666000666).

The spelling of 620000640 in words is "six hundred twenty million, six hundred forty", and thus it is an aban number.