81929076 has 24 divisors (see below), whose sum is σ = 191315040. Its totient is φ = 27288672.

The previous prime is 81929053. The next prime is 81929093. The reversal of 81929076 is 67092918.

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, 26710 + ... + 29618.

It is an arithmetic number, because the mean of its divisors is an integer number (7971460).

Almost surely, 2^81929076 is an apocalyptic number.

It is an amenable number.

81929076 is an abundant number, since it is smaller than the sum of its proper divisors (109385964).

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

81929076 is a wasteful number, since it uses less digits than its factorization.

81929076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263 (or 5261 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 81929076 is about 9051.4681682034. The cubic root of 81929076 is about 434.3228571607.

The spelling of 81929076 in words is "eighty-one million, nine hundred twenty-nine thousand, seventy-six".