87678131 has 4 divisors (see below), whose sum is σ = 89816664. Its totient is φ = 85539600.

The previous prime is 87678127. The next prime is 87678181. The reversal of 87678131 is 13187678.

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 87678131 - 2² = 87678127 is a prime.

It is a super-2 number, since 2×87678131² = 15374909311306322, 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: 2138491 = 87678131 / (8 + 7 + 6 + 7 + 8 + 1 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87678121) 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, 1069205 + ... + 1069286.

It is an arithmetic number, because the mean of its divisors is an integer number (22454166).

Almost surely, 2^87678131 is an apocalyptic number.

87678131 is a deficient number, since it is larger than the sum of its proper divisors (2138533).

87678131 is a wasteful number, since it uses less digits than its factorization.

87678131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138532.

The product of its digits is 56448, while the sum is 41.

The square root of 87678131 is about 9363.6601283900. The cubic root of 87678131 is about 444.2530599576.

The spelling of 87678131 in words is "eighty-seven million, six hundred seventy-eight thousand, one hundred thirty-one".