81594802 has 4 divisors (see below), whose sum is σ = 122392206. Its totient is φ = 40797400.

The previous prime is 81594787. The next prime is 81594847. The reversal of 81594802 is 20849518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 58660281 + 22934521 = 7659^2 + 4789^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20398699 + ... + 20398702.

Almost surely, 2^81594802 is an apocalyptic number.

81594802 is a deficient number, since it is larger than the sum of its proper divisors (40797404).

81594802 is a wasteful number, since it uses less digits than its factorization.

81594802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40797403.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 81594802 is about 9032.9841137910. The cubic root of 81594802 is about 433.7313669545.

The spelling of 81594802 in words is "eighty-one million, five hundred ninety-four thousand, eight hundred two".