87179569 has 3 divisors (see below), whose sum is σ = 87188907. Its totient is φ = 87170232.

The previous prime is 87179563. The next prime is 87179629. The reversal of 87179569 is 96597178.

It is a happy number.

The square root of 87179569 is 9337.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 82719025 + 4460544 = 9095^2 + 2112^2 .

It is not a de Polignac number, because 87179569 - 2⁵ = 87179537 is a prime.

It is a super-2 number, since 2×87179569² = 15200554502051522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87179563) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4669 + ... + 14005.

It is an arithmetic number, because the mean of its divisors is an integer number (29062969).

Almost surely, 2^87179569 is an apocalyptic number.

87179569 is the 9337-th square number.

87179569 is the 4669-th centered octagonal number.

It is an amenable number.

87179569 is a deficient number, since it is larger than the sum of its proper divisors (9338).

87179569 is an frugal number, since it uses more digits than its factorization.

87179569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18674 (or 9337 counting only the distinct ones).

The product of its digits is 952560, while the sum is 52.

The cubic root of 87179569 is about 443.4094104403.

The spelling of 87179569 in words is "eighty-seven million, one hundred seventy-nine thousand, five hundred sixty-nine".