81794404 has 24 divisors (see below), whose sum is σ = 145998720. Its totient is φ = 40086816.

The previous prime is 81794389. The next prime is 81794407. The reversal of 81794404 is 40449718.

It is not an unprimeable number, because it can be changed into a prime (81794407) 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, 63414 + ... + 64690.

It is an arithmetic number, because the mean of its divisors is an integer number (6083280).

Almost surely, 2^81794404 is an apocalyptic number.

It is an amenable number.

81794404 is a deficient number, since it is larger than the sum of its proper divisors (64204316).

81794404 is a wasteful number, since it uses less digits than its factorization.

81794404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1587 (or 1585 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 81794404 is about 9044.0258734703. The cubic root of 81794404 is about 434.0847520073.

The spelling of 81794404 in words is "eighty-one million, seven hundred ninety-four thousand, four hundred four".