81940832 has 12 divisors (see below), whose sum is σ = 161321076. Its totient is φ = 40970400.

The previous prime is 81940823. The next prime is 81940849. The reversal of 81940832 is 23804918.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 81940792 and 81940801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280294 + ... + 1280357.

It is an arithmetic number, because the mean of its divisors is an integer number (13443423).

Almost surely, 2^81940832 is an apocalyptic number.

It is an amenable number.

81940832 is a deficient number, since it is larger than the sum of its proper divisors (79380244).

81940832 is a wasteful number, since it uses less digits than its factorization.

81940832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2560661 (or 2560653 counting only the distinct ones).

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

The square root of 81940832 is about 9052.1175423212. The cubic root of 81940832 is about 434.3436298240.

The spelling of 81940832 in words is "eighty-one million, nine hundred forty thousand, eight hundred thirty-two".