621564040 has 32 divisors (see below), whose sum is σ = 1400235480. Its totient is φ = 248320512.

The previous prime is 621564023. The next prime is 621564061. The reversal of 621564040 is 40465126.

It can be written as a sum of positive squares in 4 ways, for example, as 253000836 + 368563204 = 15906^2 + 19198^2 .

It is a super-2 number, since 2×621564040² = 772683711642243200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25012 + ... + 43228.

Almost surely, 2^621564040 is an apocalyptic number.

It is an amenable number.

621564040 is an abundant number, since it is smaller than the sum of its proper divisors (778671440).

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

621564040 is a wasteful number, since it uses less digits than its factorization.

621564040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19081 (or 19077 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 621564040 is about 24931.1860929239. The cubic root of 621564040 is about 853.4183176808.

The spelling of 621564040 in words is "six hundred twenty-one million, five hundred sixty-four thousand, forty".