72015139 has 32 divisors (see below), whose sum is σ = 90832896. Its totient is φ = 55740960.

The previous prime is 72015137. The next prime is 72015169. The reversal of 72015139 is 93151027.

It is not a de Polignac number, because 72015139 - 2¹ = 72015137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72015131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234424 + ... + 234730.

It is an arithmetic number, because the mean of its divisors is an integer number (2838528).

Almost surely, 2^72015139 is an apocalyptic number.

72015139 is a deficient number, since it is larger than the sum of its proper divisors (18817757).

72015139 is a wasteful number, since it uses less digits than its factorization.

72015139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 72015139 is about 8486.1734014808. The cubic root of 72015139 is about 416.0459203346.

The spelling of 72015139 in words is "seventy-two million, fifteen thousand, one hundred thirty-nine".