1620985688 has 32 divisors (see below), whose sum is σ = 3567424800. Its totient is φ = 675931392.

The previous prime is 1620985657. The next prime is 1620985727. The reversal of 1620985688 is 8865890261.

It is a congruent number.

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, 389093 + ... + 393236.

It is an arithmetic number, because the mean of its divisors is an integer number (111482025).

Almost surely, 2^1620985688 is an apocalyptic number.

It is an amenable number.

1620985688 is an abundant number, since it is smaller than the sum of its proper divisors (1946439112).

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

1620985688 is a wasteful number, since it uses less digits than its factorization.

1620985688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782379 (or 782375 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 53.

The square root of 1620985688 is about 40261.4665406018. The cubic root of 1620985688 is about 1174.6984439361.

The spelling of 1620985688 in words is "one billion, six hundred twenty million, nine hundred eighty-five thousand, six hundred eighty-eight".