81883372 has 12 divisors (see below), whose sum is σ = 143360280. Its totient is φ = 40923296.

The previous prime is 81883367. The next prime is 81883379. The reversal of 81883372 is 27338818.

It is a super-2 number, since 2×81883372² = 13409773220180768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81883379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12408 + ... + 17824.

It is an arithmetic number, because the mean of its divisors is an integer number (11946690).

Almost surely, 2^81883372 is an apocalyptic number.

It is an amenable number.

81883372 is a deficient number, since it is larger than the sum of its proper divisors (61476908).

81883372 is a wasteful number, since it uses less digits than its factorization.

81883372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9200 (or 9198 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 81883372 is about 9048.9431427101. The cubic root of 81883372 is about 434.2420800418.

The spelling of 81883372 in words is "eighty-one million, eight hundred eighty-three thousand, three hundred seventy-two".