87180823 has 4 divisors (see below), whose sum is σ = 89208328. Its totient is φ = 85153320.

The previous prime is 87180809. The next prime is 87180857. The reversal of 87180823 is 32808178.

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 87180823 - 2¹⁷ = 87049751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87180623) 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, 1013688 + ... + 1013773.

It is an arithmetic number, because the mean of its divisors is an integer number (22302082).

Almost surely, 2^87180823 is an apocalyptic number.

87180823 is a deficient number, since it is larger than the sum of its proper divisors (2027505).

87180823 is a wasteful number, since it uses less digits than its factorization.

87180823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2027504.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 87180823 is about 9337.0671519487. The cubic root of 87180823 is about 443.4115364458.

The spelling of 87180823 in words is "eighty-seven million, one hundred eighty thousand, eight hundred twenty-three".