6421250560 has 80 divisors (see below), whose sum is σ = 15432184152. Its totient is φ = 2562457600.

The previous prime is 6421250551. The next prime is 6421250569. The reversal of 6421250560 is 650521246.

It is an interprime number because it is at equal distance from previous prime (6421250551) and next prime (6421250569).

It can be written as a sum of positive squares in 4 ways, for example, as 5269598464 + 1151652096 = 72592^2 + 33936^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×6421250560³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6421250569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1177440 + ... + 1182880.

Almost surely, 2^6421250560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6421250560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7716092076).

6421250560 is an abundant number, since it is smaller than the sum of its proper divisors (9010933592).

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

6421250560 is an equidigital number, since it uses as much as digits as its factorization.

6421250560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5925 (or 5909 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 6421250560 is about 80132.7059320974. The cubic root of 6421250560 is about 1858.6881874496.

The spelling of 6421250560 in words is "six billion, four hundred twenty-one million, two hundred fifty thousand, five hundred sixty".