138668080 has 40 divisors (see below), whose sum is σ = 339375600. Its totient is φ = 52547328.

The previous prime is 138668071. The next prime is 138668107. The reversal of 138668080 is 80866831.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

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, 44095 + ... + 47134.

It is an arithmetic number, because the mean of its divisors is an integer number (8484390).

Almost surely, 2^138668080 is an apocalyptic number.

138668080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138668080 is an abundant number, since it is smaller than the sum of its proper divisors (200707520).

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

138668080 is a wasteful number, since it uses less digits than its factorization.

138668080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91261 (or 91255 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 138668080 is about 11775.7411656337. The cubic root of 138668080 is about 517.5974969361.

The spelling of 138668080 in words is "one hundred thirty-eight million, six hundred sixty-eight thousand, eighty".