81928232 has 8 divisors (see below), whose sum is σ = 153615450. Its totient is φ = 40964112.

The previous prime is 81928229. The next prime is 81928241. The reversal of 81928232 is 23282918.

It can be written as a sum of positive squares in only one way, i.e., 66357316 + 15570916 = 8146^2 + 3946^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 81928192 and 81928201.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5120507 + ... + 5120522.

Almost surely, 2^81928232 is an apocalyptic number.

It is an amenable number.

81928232 is a deficient number, since it is larger than the sum of its proper divisors (71687218).

81928232 is a wasteful number, since it uses less digits than its factorization.

81928232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10241035 (or 10241031 counting only the distinct ones).

The product of its digits is 13824, while the sum is 35.

The square root of 81928232 is about 9051.4215458126. The cubic root of 81928232 is about 434.3213657498.

The spelling of 81928232 in words is "eighty-one million, nine hundred twenty-eight thousand, two hundred thirty-two".