621616605 has 16 divisors (see below), whose sum is σ = 997028160. Its totient is φ = 330715008.

The previous prime is 621616603. The next prime is 621616609. The reversal of 621616605 is 506616126.

It is not a de Polignac number, because 621616605 - 2¹ = 621616603 is a prime.

It is a super-2 number, since 2×621616605² = 772814407223452050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621616601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44527 + ... + 56796.

It is an arithmetic number, because the mean of its divisors is an integer number (62314260).

Almost surely, 2^621616605 is an apocalyptic number.

It is an amenable number.

621616605 is a deficient number, since it is larger than the sum of its proper divisors (375411555).

621616605 is a wasteful number, since it uses less digits than its factorization.

621616605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101740.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 621616605 is about 24932.2402723863. The cubic root of 621616605 is about 853.4423745580.

The spelling of 621616605 in words is "six hundred twenty-one million, six hundred sixteen thousand, six hundred five".