72501139 has 12 divisors (see below), whose sum is σ = 75099096. Its totient is φ = 69986112.

The previous prime is 72501113. The next prime is 72501193. The reversal of 72501139 is 93110527.

72501139 = T₈₀ + T₈₁ + ... + T₇₅₇.

It is not a de Polignac number, because 72501139 - 2¹⁵ = 72468371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72501109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208764 + ... + 209110.

It is an arithmetic number, because the mean of its divisors is an integer number (6258258).

Almost surely, 2^72501139 is an apocalyptic number.

72501139 is a deficient number, since it is larger than the sum of its proper divisors (2597957).

72501139 is a wasteful number, since it uses less digits than its factorization.

72501139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 503 counting only the distinct ones).

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

The square root of 72501139 is about 8514.7600670835. The cubic root of 72501139 is about 416.9797293790.

The spelling of 72501139 in words is "seventy-two million, five hundred one thousand, one hundred thirty-nine".