621609992 has 16 divisors (see below), whose sum is σ = 1166292540. Its totient is φ = 310598656.

The previous prime is 621609959. The next prime is 621610001. The reversal of 621609992 is 299906126.

It can be written as a sum of positive squares in 2 ways, for example, as 461992036 + 159617956 = 21494^2 + 12634^2 .

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, 12593 + ... + 37440.

Almost surely, 2^621609992 is an apocalyptic number.

It is an amenable number.

621609992 is a deficient number, since it is larger than the sum of its proper divisors (544682548).

621609992 is a wasteful number, since it uses less digits than its factorization.

621609992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51592 (or 51588 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 621609992 is about 24932.1076525832. The cubic root of 621609992 is about 853.4393481296.

The spelling of 621609992 in words is "six hundred twenty-one million, six hundred nine thousand, nine hundred ninety-two".