81792312 has 64 divisors (see below), whose sum is σ = 235008000. Its totient is φ = 23237760.

The previous prime is 81792281. The next prime is 81792329. The reversal of 81792312 is 21329718.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30814 + ... + 33362.

It is an arithmetic number, because the mean of its divisors is an integer number (3672000).

Almost surely, 2^81792312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81792312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117504000).

81792312 is an abundant number, since it is smaller than the sum of its proper divisors (153215688).

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

81792312 is a wasteful number, since it uses less digits than its factorization.

81792312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756 (or 2752 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 81792312 is about 9043.9102162726. The cubic root of 81792312 is about 434.0810512120.

The spelling of 81792312 in words is "eighty-one million, seven hundred ninety-two thousand, three hundred twelve".