81738056 has 16 divisors (see below), whose sum is σ = 154032000. Its totient is φ = 40662864.

The previous prime is 81738053. The next prime is 81738073. The reversal of 81738056 is 65083718.

It is a super-2 number, since 2×81738056² = 13362219597318272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81738053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24080 + ... + 27263.

It is an arithmetic number, because the mean of its divisors is an integer number (9627000).

Almost surely, 2^81738056 is an apocalyptic number.

It is an amenable number.

81738056 is a deficient number, since it is larger than the sum of its proper divisors (72293944).

81738056 is a wasteful number, since it uses less digits than its factorization.

81738056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51548 (or 51544 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 81738056 is about 9040.9101311760. The cubic root of 81738056 is about 433.9850490719.

The spelling of 81738056 in words is "eighty-one million, seven hundred thirty-eight thousand, fifty-six".