71686404 has 24 divisors (see below), whose sum is σ = 185853920. Its totient is φ = 23895432.

The previous prime is 71686403. The next prime is 71686429. The reversal of 71686404 is 40468617.

71686404 is a `hidden beast` number, since 7 + 1 + 6 + 8 + 640 + 4 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (71686403) 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, 331774 + ... + 331989.

Almost surely, 2^71686404 is an apocalyptic number.

It is an amenable number.

71686404 is an abundant number, since it is smaller than the sum of its proper divisors (114167516).

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

71686404 is a wasteful number, since it uses less digits than its factorization.

71686404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663776 (or 663768 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 71686404 is about 8466.7823876606. The cubic root of 71686404 is about 415.4118985878.

The spelling of 71686404 in words is "seventy-one million, six hundred eighty-six thousand, four hundred four".