81683504 has 40 divisors (see below), whose sum is σ = 191514528. Its totient is φ = 32947200.

The previous prime is 81683501. The next prime is 81683587. The reversal of 81683504 is 40538618.

It is not an unprimeable number, because it can be changed into a prime (81683501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19547 + ... + 23354.

Almost surely, 2^81683504 is an apocalyptic number.

It is an amenable number.

81683504 is an abundant number, since it is smaller than the sum of its proper divisors (109831024).

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

81683504 is a wasteful number, since it uses less digits than its factorization.

81683504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42933 (or 42927 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 81683504 is about 9037.8926747334. The cubic root of 81683504 is about 433.8884803402. Note that the first 3 decimals are identical.

The spelling of 81683504 in words is "eighty-one million, six hundred eighty-three thousand, five hundred four".