81933160 has 16 divisors (see below), whose sum is σ = 184349700. Its totient is φ = 32773248.

The previous prime is 81933157. The next prime is 81933169. The reversal of 81933160 is 6133918.

It can be written as a sum of positive squares in 2 ways, for example, as 75307684 + 6625476 = 8678^2 + 2574^2 .

It is not an unprimeable number, because it can be changed into a prime (81933169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1024125 + ... + 1024204.

Almost surely, 2^81933160 is an apocalyptic number.

It is an amenable number.

81933160 is an abundant number, since it is smaller than the sum of its proper divisors (102416540).

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

81933160 is a wasteful number, since it uses less digits than its factorization.

81933160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2048340 (or 2048336 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 81933160 is about 9051.6937641527. The cubic root of 81933160 is about 434.3300737484.

The spelling of 81933160 in words is "eighty-one million, nine hundred thirty-three thousand, one hundred sixty".