1639968904 has 16 divisors (see below), whose sum is σ = 3514219200. Its totient is φ = 702843792.

The previous prime is 1639968899. The next prime is 1639968943. The reversal of 1639968904 is 4098699361.

It is a super-2 number, since 2×1639968904² = 5378996012173922432, which contains 22 as substring.

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, 14642524 + ... + 14642635.

It is an arithmetic number, because the mean of its divisors is an integer number (219638700).

Almost surely, 2^1639968904 is an apocalyptic number.

1639968904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1639968904 is an abundant number, since it is smaller than the sum of its proper divisors (1874250296).

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

1639968904 is a wasteful number, since it uses less digits than its factorization.

1639968904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29285172 (or 29285168 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 1639968904 is about 40496.5295303190. The cubic root of 1639968904 is about 1179.2662545536.

The spelling of 1639968904 in words is "one billion, six hundred thirty-nine million, nine hundred sixty-eight thousand, nine hundred four".