81895404 has 12 divisors (see below), whose sum is σ = 191089304. Its totient is φ = 27298464.

The previous prime is 81895379. The next prime is 81895427. The reversal of 81895404 is 40459818.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3412297 + ... + 3412320.

Almost surely, 2^81895404 is an apocalyptic number.

It is an amenable number.

81895404 is an abundant number, since it is smaller than the sum of its proper divisors (109193900).

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

81895404 is a wasteful number, since it uses less digits than its factorization.

81895404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6824624 (or 6824622 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 81895404 is about 9049.6079473091. The cubic root of 81895404 is about 434.2633482785.

The spelling of 81895404 in words is "eighty-one million, eight hundred ninety-five thousand, four hundred four".