138626464 has 48 divisors (see below), whose sum is σ = 278486208. Its totient is φ = 67917312.

The previous prime is 138626443. The next prime is 138626473. The reversal of 138626464 is 464626831.

It is a super-2 number, since 2×138626464² = 38434593042286592, which contains 22 as substring.

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, 451399 + ... + 451705.

It is an arithmetic number, because the mean of its divisors is an integer number (5801796).

Almost surely, 2^138626464 is an apocalyptic number.

It is an amenable number.

138626464 is an abundant number, since it is smaller than the sum of its proper divisors (139859744).

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

138626464 is a wasteful number, since it uses less digits than its factorization.

138626464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 549 counting only the distinct ones).

The product of its digits is 165888, while the sum is 40.

The square root of 138626464 is about 11773.9740105030. The cubic root of 138626464 is about 517.5457126259.

The spelling of 138626464 in words is "one hundred thirty-eight million, six hundred twenty-six thousand, four hundred sixty-four".