72000138 has 16 divisors (see below), whose sum is σ = 164571840. Its totient is φ = 20571456.

The previous prime is 72000133. The next prime is 72000161. The reversal of 72000138 is 83100027.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72000133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 857103 + ... + 857186.

It is an arithmetic number, because the mean of its divisors is an integer number (10285740).

Almost surely, 2^72000138 is an apocalyptic number.

72000138 is an abundant number, since it is smaller than the sum of its proper divisors (92571702).

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

72000138 is a wasteful number, since it uses less digits than its factorization.

72000138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1714301.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 72000138 is about 8485.2895059627. The cubic root of 72000138 is about 416.0170303987.

The spelling of 72000138 in words is "seventy-two million, one hundred thirty-eight", and thus it is an aban number.