80987579 has 4 divisors (see below), whose sum is σ = 81350976. Its totient is φ = 80624184.

The previous prime is 80987567. The next prime is 80987581. The reversal of 80987579 is 97578908.

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 80987579 - 2⁴ = 80987563 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80987579.

It is not an unprimeable number, because it can be changed into a prime (80987509) 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, 181364 + ... + 181809.

It is an arithmetic number, because the mean of its divisors is an integer number (20337744).

Almost surely, 2^80987579 is an apocalyptic number.

80987579 is a deficient number, since it is larger than the sum of its proper divisors (363397).

80987579 is a wasteful number, since it uses less digits than its factorization.

80987579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363396.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The square root of 80987579 is about 8999.3099179882. The cubic root of 80987579 is about 432.6527536877.

It can be divided in two parts, 809 and 87579, that added together give a palindrome (88388).

The spelling of 80987579 in words is "eighty million, nine hundred eighty-seven thousand, five hundred seventy-nine".