87139579 has 4 divisors (see below), whose sum is σ = 88783776. Its totient is φ = 85495384.

The previous prime is 87139573. The next prime is 87139651. The reversal of 87139579 is 97593178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87139579 - 2⁹ = 87139067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87139573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822019 + ... + 822124.

It is an arithmetic number, because the mean of its divisors is an integer number (22195944).

Almost surely, 2^87139579 is an apocalyptic number.

87139579 is a deficient number, since it is larger than the sum of its proper divisors (1644197).

87139579 is a wasteful number, since it uses less digits than its factorization.

87139579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644196.

The product of its digits is 476280, while the sum is 49.

The square root of 87139579 is about 9334.8582742321. The cubic root of 87139579 is about 443.3416015317.

The spelling of 87139579 in words is "eighty-seven million, one hundred thirty-nine thousand, five hundred seventy-nine".