625661064 has 256 divisors, whose sum is σ = 2132697600. Its totient is φ = 165888000.

The previous prime is 625661063. The next prime is 625661087. The reversal of 625661064 is 460166526.

It is a happy number.

It is a super-2 number, since 2×625661064² = 782903534011224192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (625661063) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2595984 + ... + 2596224.

It is an arithmetic number, because the mean of its divisors is an integer number (8330850).

Almost surely, 2^625661064 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 625661064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1066348800).

625661064 is an abundant number, since it is smaller than the sum of its proper divisors (1507036536).

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

625661064 is a wasteful number, since it uses less digits than its factorization.

625661064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 625661064 is about 25013.2177858028. The cubic root of 625661064 is about 855.2893080663.

The spelling of 625661064 in words is "six hundred twenty-five million, six hundred sixty-one thousand, sixty-four".