138455664 has 20 divisors (see below), whose sum is σ = 357677256. Its totient is φ = 46151872.

The previous prime is 138455659. The next prime is 138455671. The reversal of 138455664 is 466554831.

It is a congruent number.

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, 1442199 + ... + 1442294.

Almost surely, 2^138455664 is an apocalyptic number.

It is an amenable number.

138455664 is an abundant number, since it is smaller than the sum of its proper divisors (219221592).

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

138455664 is a wasteful number, since it uses less digits than its factorization.

138455664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884504 (or 2884498 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The square root of 138455664 is about 11766.7184890266. The cubic root of 138455664 is about 517.3330713205. Note that the first 3 decimals are identical.

The spelling of 138455664 in words is "one hundred thirty-eight million, four hundred fifty-five thousand, six hundred sixty-four".