81792306 has 24 divisors (see below), whose sum is σ = 177916284. Its totient is φ = 27156480.

The previous prime is 81792281. The next prime is 81792329. The reversal of 81792306 is 60329718.

It can be written as a sum of positive squares in 2 ways, for example, as 78163281 + 3629025 = 8841^2 + 1905^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4215 + ... + 13466.

Almost surely, 2^81792306 is an apocalyptic number.

81792306 is an abundant number, since it is smaller than the sum of its proper divisors (96123978).

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

81792306 is a wasteful number, since it uses less digits than its factorization.

81792306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17946 (or 17943 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81792306 is about 9043.9098845577. The cubic root of 81792306 is about 434.0810405977.

The spelling of 81792306 in words is "eighty-one million, seven hundred ninety-two thousand, three hundred six".