87878681 has 4 divisors (see below), whose sum is σ = 95867664. Its totient is φ = 79889700.

The previous prime is 87878603. The next prime is 87878683. The reversal of 87878681 is 18687878.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87878681 - 2¹⁸ = 87616537 is a prime.

It is a super-2 number, since 2×87878681² = 15445325148599522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87878683) 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, 3994475 + ... + 3994496.

It is an arithmetic number, because the mean of its divisors is an integer number (23966916).

Almost surely, 2^87878681 is an apocalyptic number.

It is an amenable number.

87878681 is a deficient number, since it is larger than the sum of its proper divisors (7988983).

87878681 is a wasteful number, since it uses less digits than its factorization.

87878681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7988982.

The product of its digits is 1204224, while the sum is 53.

The square root of 87878681 is about 9374.3629650233. The cubic root of 87878681 is about 444.5915218070.

The spelling of 87878681 in words is "eighty-seven million, eight hundred seventy-eight thousand, six hundred eighty-one".