81934432 has 36 divisors (see below), whose sum is σ = 163570428. Its totient is φ = 40400000.

The previous prime is 81934423. The next prime is 81934439. The reversal of 81934432 is 23443918.

It is a super-2 number, since 2×81934432² = 13426502294325248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81934439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 326307 + ... + 326557.

It is an arithmetic number, because the mean of its divisors is an integer number (4543623).

Almost surely, 2^81934432 is an apocalyptic number.

It is an amenable number.

81934432 is a deficient number, since it is larger than the sum of its proper divisors (81635996).

81934432 is a wasteful number, since it uses less digits than its factorization.

81934432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 354 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 81934432 is about 9051.7640269729. The cubic root of 81934432 is about 434.3323213731.

The spelling of 81934432 in words is "eighty-one million, nine hundred thirty-four thousand, four hundred thirty-two".