137907688 has 8 divisors (see below), whose sum is σ = 258576930. Its totient is φ = 68953840.

The previous prime is 137907667. The next prime is 137907697. The reversal of 137907688 is 886709731.

It can be written as a sum of positive squares in only one way, i.e., 137874564 + 33124 = 11742^2 + 182^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8619223 + ... + 8619238.

Almost surely, 2^137907688 is an apocalyptic number.

It is an amenable number.

137907688 is a deficient number, since it is larger than the sum of its proper divisors (120669242).

137907688 is a wasteful number, since it uses less digits than its factorization.

137907688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17238467 (or 17238463 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 137907688 is about 11743.4104075435. The cubic root of 137907688 is about 516.6496734381.

The spelling of 137907688 in words is "one hundred thirty-seven million, nine hundred seven thousand, six hundred eighty-eight".