72670138 has 16 divisors (see below), whose sum is σ = 119142144. Its totient is φ = 33094080.

The previous prime is 72670111. The next prime is 72670139. The reversal of 72670138 is 83107627.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (72670139) 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, 33420 + ... + 35527.

It is an arithmetic number, because the mean of its divisors is an integer number (7446384).

Almost surely, 2^72670138 is an apocalyptic number.

72670138 is a deficient number, since it is larger than the sum of its proper divisors (46472006).

72670138 is a wasteful number, since it uses less digits than its factorization.

72670138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68997.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 72670138 is about 8524.6781757436. The cubic root of 72670138 is about 417.3034690007.

The spelling of 72670138 in words is "seventy-two million, six hundred seventy thousand, one hundred thirty-eight".