87813923 has 4 divisors (see below), whose sum is σ = 89955768. Its totient is φ = 85672080.

The previous prime is 87813919. The next prime is 87813941. The reversal of 87813923 is 32931878.

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 87813923 - 2² = 87813919 is a prime.

It is a super-2 number, since 2×87813923² = 15422570145299858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 2141803 = 87813923 / (8 + 7 + 8 + 1 + 3 + 9 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87813023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070861 + ... + 1070942.

It is an arithmetic number, because the mean of its divisors is an integer number (22488942).

Almost surely, 2^87813923 is an apocalyptic number.

87813923 is a deficient number, since it is larger than the sum of its proper divisors (2141845).

87813923 is a wasteful number, since it uses less digits than its factorization.

87813923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141844.

The product of its digits is 72576, while the sum is 41.

The square root of 87813923 is about 9370.9083337743. The cubic root of 87813923 is about 444.4822881364.

The spelling of 87813923 in words is "eighty-seven million, eight hundred thirteen thousand, nine hundred twenty-three".