621615040 has 28 divisors (see below), whose sum is σ = 1480221576. Its totient is φ = 248645888.

The previous prime is 621615031. The next prime is 621615053. The reversal of 621615040 is 40516126.

It is a junction number, because it is equal to n+sod(n) for n = 621614996 and 621615014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970954 + ... + 971593.

Almost surely, 2^621615040 is an apocalyptic number.

It is an amenable number.

621615040 is an abundant number, since it is smaller than the sum of its proper divisors (858606536).

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

621615040 is a wasteful number, since it uses less digits than its factorization.

621615040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942564 (or 1942554 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 621615040 is about 24932.2088873008. The cubic root of 621615040 is about 853.4416583403.

The spelling of 621615040 in words is "six hundred twenty-one million, six hundred fifteen thousand, forty".