81054972 has 24 divisors (see below), whose sum is σ = 210142800. Its totient is φ = 27018288.

The previous prime is 81054937. The next prime is 81054977. The reversal of 81054972 is 27945018.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81054977) 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, 375147 + ... + 375362.

It is an arithmetic number, because the mean of its divisors is an integer number (8755950).

Almost surely, 2^81054972 is an apocalyptic number.

It is an amenable number.

81054972 is an abundant number, since it is smaller than the sum of its proper divisors (129087828).

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

81054972 is a wasteful number, since it uses less digits than its factorization.

81054972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750522 (or 750514 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 81054972 is about 9003.0534820138. The cubic root of 81054972 is about 432.7727296286.

The spelling of 81054972 in words is "eighty-one million, fifty-four thousand, nine hundred seventy-two".