81292892 has 24 divisors (see below), whose sum is σ = 146153280. Its totient is φ = 39545280.

The previous prime is 81292889. The next prime is 81292901. The reversal of 81292892 is 29829218.

It is a congruent number.

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, 32834 + ... + 35222.

It is an arithmetic number, because the mean of its divisors is an integer number (6089720).

Almost surely, 2^81292892 is an apocalyptic number.

It is an amenable number.

81292892 is a deficient number, since it is larger than the sum of its proper divisors (64860388).

81292892 is a wasteful number, since it uses less digits than its factorization.

81292892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621 (or 2619 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 81292892 is about 9016.2570948260. The cubic root of 81292892 is about 433.1957540891.

The spelling of 81292892 in words is "eighty-one million, two hundred ninety-two thousand, eight hundred ninety-two".