81928896 has 112 divisors (see below), whose sum is σ = 253203456. Its totient is φ = 22892544.

The previous prime is 81928879. The next prime is 81928901. The reversal of 81928896 is 69882918.

It is a tau number, because it is divible by the number of its divisors (112).

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, 62520 + ... + 63816.

Almost surely, 2^81928896 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 81928896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126601728).

81928896 is an abundant number, since it is smaller than the sum of its proper divisors (171274560).

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

81928896 is a wasteful number, since it uses less digits than its factorization.

81928896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366 (or 1356 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 81928896 is about 9051.4582250597. The cubic root of 81928896 is about 434.3225390882.

The spelling of 81928896 in words is "eighty-one million, nine hundred twenty-eight thousand, eight hundred ninety-six".