621607857 has 48 divisors (see below), whose sum is σ = 952712640. Its totient is φ = 359334144.

The previous prime is 621607849. The next prime is 621607859. The reversal of 621607857 is 758706126.

It is not a de Polignac number, because 621607857 - 2³ = 621607849 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621607859) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1666323 + ... + 1666695.

It is an arithmetic number, because the mean of its divisors is an integer number (19848180).

Almost surely, 2^621607857 is an apocalyptic number.

It is an amenable number.

621607857 is a deficient number, since it is larger than the sum of its proper divisors (331104783).

621607857 is a wasteful number, since it uses less digits than its factorization.

621607857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 621607857 is about 24932.0648362706. The cubic root of 621607857 is about 853.4383710458.

The spelling of 621607857 in words is "six hundred twenty-one million, six hundred seven thousand, eight hundred fifty-seven".