81146756 has 12 divisors (see below), whose sum is σ = 146903820. Its totient is φ = 39174240.

The previous prime is 81146753. The next prime is 81146773. The reversal of 81146756 is 65764118.

It can be written as a sum of positive squares in 2 ways, for example, as 31922500 + 49224256 = 5650^2 + 7016^2 .

It is not an unprimeable number, because it can be changed into a prime (81146753) 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, 349655 + ... + 349886.

It is an arithmetic number, because the mean of its divisors is an integer number (12241985).

Almost surely, 2^81146756 is an apocalyptic number.

It is an amenable number.

81146756 is a deficient number, since it is larger than the sum of its proper divisors (65757064).

81146756 is a wasteful number, since it uses less digits than its factorization.

81146756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699574 (or 699572 counting only the distinct ones).

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

The square root of 81146756 is about 9008.1494214961. The cubic root of 81146756 is about 432.9360205718.

The spelling of 81146756 in words is "eighty-one million, one hundred forty-six thousand, seven hundred fifty-six".