81792999 has 12 divisors (see below), whose sum is σ = 118245400. Its totient is φ = 54482544.

The previous prime is 81792989. The next prime is 81793007. The reversal of 81792999 is 99929718.

It is not a de Polignac number, because 81792999 - 2¹⁷ = 81661927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81792959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10017 + ... + 16245.

Almost surely, 2^81792999 is an apocalyptic number.

81792999 is a deficient number, since it is larger than the sum of its proper divisors (36452401).

81792999 is a wasteful number, since it uses less digits than its factorization.

81792999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7694 (or 7691 counting only the distinct ones).

The product of its digits is 734832, while the sum is 54.

The square root of 81792999 is about 9043.9481975518. The cubic root of 81792999 is about 434.0822665375.

The spelling of 81792999 in words is "eighty-one million, seven hundred ninety-two thousand, nine hundred ninety-nine".