86981808 has 20 divisors (see below), whose sum is σ = 224703128. Its totient is φ = 28993920.

The previous prime is 86981803. The next prime is 86981821. The reversal of 86981808 is 80818968.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 1812121 = 86981808 / (8 + 6 + 9 + 8 + 1 + 8 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (86981803) 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, 906013 + ... + 906108.

Almost surely, 2^86981808 is an apocalyptic number.

It is an amenable number.

86981808 is an abundant number, since it is smaller than the sum of its proper divisors (137721320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86981808 is a wasteful number, since it uses less digits than its factorization.

86981808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812132 (or 1812126 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 48.

The square root of 86981808 is about 9326.4038085427. The cubic root of 86981808 is about 443.0738751052.

The spelling of 86981808 in words is "eighty-six million, nine hundred eighty-one thousand, eight hundred eight".