72139587 has 8 divisors (see below), whose sum is σ = 103585104. Its totient is φ = 44393568.

The previous prime is 72139583. The next prime is 72139597. The reversal of 72139587 is 78593127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72139587 - 2² = 72139583 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (72139583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924828 + ... + 924905.

It is an arithmetic number, because the mean of its divisors is an integer number (12948138).

Almost surely, 2^72139587 is an apocalyptic number.

72139587 is a deficient number, since it is larger than the sum of its proper divisors (31445517).

72139587 is a wasteful number, since it uses less digits than its factorization.

72139587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849749.

The product of its digits is 105840, while the sum is 42.

The square root of 72139587 is about 8493.5026343670. The cubic root of 72139587 is about 416.2854361160.

The spelling of 72139587 in words is "seventy-two million, one hundred thirty-nine thousand, five hundred eighty-seven".