69991904 has 12 divisors (see below), whose sum is σ = 137796624. Its totient is φ = 34995936.

The previous prime is 69991903. The next prime is 69991919. The reversal of 69991904 is 40919996.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69991903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093592 + ... + 1093655.

It is an arithmetic number, because the mean of its divisors is an integer number (11483052).

Almost surely, 2^69991904 is an apocalyptic number.

It is an amenable number.

69991904 is a deficient number, since it is larger than the sum of its proper divisors (67804720).

69991904 is a wasteful number, since it uses less digits than its factorization.

69991904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187257 (or 2187249 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 69991904 is about 8366.1164228093. The cubic root of 69991904 is about 412.1126408322.

The spelling of 69991904 in words is "sixty-nine million, nine hundred ninety-one thousand, nine hundred four".