625621506 has 8 divisors (see below), whose sum is σ = 1251243024. Its totient is φ = 208540500.

The previous prime is 625621499. The next prime is 625621519. The reversal of 625621506 is 605126526.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

625621506 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52135120 + ... + 52135131.

It is an arithmetic number, because the mean of its divisors is an integer number (156405378).

Almost surely, 2^625621506 is an apocalyptic number.

625621506 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

625621506 is a wasteful number, since it uses less digits than its factorization.

625621506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104270256.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 625621506 is about 25012.4270313778. The cubic root of 625621506 is about 855.2712822003.

The spelling of 625621506 in words is "six hundred twenty-five million, six hundred twenty-one thousand, five hundred six".