81275932 has 12 divisors (see below), whose sum is σ = 142375576. Its totient is φ = 40597200.

The previous prime is 81275927. The next prime is 81275933. The reversal of 81275932 is 23957218.

It is a junction number, because it is equal to n+sod(n) for n = 81275891 and 81275900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81275933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5463 + ... + 13870.

Almost surely, 2^81275932 is an apocalyptic number.

It is an amenable number.

81275932 is a deficient number, since it is larger than the sum of its proper divisors (61099644).

81275932 is a wasteful number, since it uses less digits than its factorization.

81275932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20388 (or 20386 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 81275932 is about 9015.3165224522. The cubic root of 81275932 is about 433.1656263588.

The spelling of 81275932 in words is "eighty-one million, two hundred seventy-five thousand, nine hundred thirty-two".