81792916 has 12 divisors (see below), whose sum is σ = 151557588. Its totient is φ = 38490752.

The previous prime is 81792913. The next prime is 81792917. The reversal of 81792916 is 61929718.

It can be written as a sum of positive squares in 2 ways, for example, as 56250000 + 25542916 = 7500^2 + 5054^2 .

It is a super-2 number, since 2×81792916² = 13380162215566112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81792913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 601351 + ... + 601486.

It is an arithmetic number, because the mean of its divisors is an integer number (12629799).

Almost surely, 2^81792916 is an apocalyptic number.

It is an amenable number.

81792916 is a deficient number, since it is larger than the sum of its proper divisors (69764672).

81792916 is a wasteful number, since it uses less digits than its factorization.

81792916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202858 (or 1202856 counting only the distinct ones).

The product of its digits is 54432, while the sum is 43.

The square root of 81792916 is about 9043.9436088468. The cubic root of 81792916 is about 434.0821197081.

The spelling of 81792916 in words is "eighty-one million, seven hundred ninety-two thousand, nine hundred sixteen".