81282792 has 32 divisors (see below), whose sum is σ = 206244000. Its totient is φ = 26689344.

The previous prime is 81282781. The next prime is 81282809. The reversal of 81282792 is 29728218.

It is a self number, because there is not a number n which added to its sum of digits gives 81282792.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23667 + ... + 26882.

It is an arithmetic number, because the mean of its divisors is an integer number (6445125).

Almost surely, 2^81282792 is an apocalyptic number.

It is an amenable number.

81282792 is an abundant number, since it is smaller than the sum of its proper divisors (124961208).

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

81282792 is a wasteful number, since it uses less digits than its factorization.

81282792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50625 (or 50621 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 81282792 is about 9015.6969780489. The cubic root of 81282792 is about 433.1778129620.

The spelling of 81282792 in words is "eighty-one million, two hundred eighty-two thousand, seven hundred ninety-two".