86640408 has 32 divisors (see below), whose sum is σ = 240668400. Its totient is φ = 28880064.

The previous prime is 86640373. The next prime is 86640409. The reversal of 86640408 is 80404668.

86640408 is a `hidden beast` number, since 8 + 6 + 640 + 4 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86640409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200341 + ... + 200772.

Almost surely, 2^86640408 is an apocalyptic number.

It is an amenable number.

86640408 is an abundant number, since it is smaller than the sum of its proper divisors (154027992).

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

86640408 is a wasteful number, since it uses less digits than its factorization.

86640408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401128 (or 401118 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 86640408 is about 9308.0829390374. The cubic root of 86640408 is about 442.4934328241.

The spelling of 86640408 in words is "eighty-six million, six hundred forty thousand, four hundred eight".