81054784 has 28 divisors (see below), whose sum is σ = 161209228. Its totient is φ = 40435200.

The previous prime is 81054781. The next prime is 81054821. The reversal of 81054784 is 48745018.

It can be written as a sum of positive squares in 2 ways, for example, as 42614784 + 38440000 = 6528^2 + 6200^2 .

It is not an unprimeable number, because it can be changed into a prime (81054781) 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, 33454 + ... + 35794.

Almost surely, 2^81054784 is an apocalyptic number.

It is an amenable number.

81054784 is a deficient number, since it is larger than the sum of its proper divisors (80154444).

81054784 is a wasteful number, since it uses less digits than its factorization.

81054784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894 (or 2884 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 81054784 is about 9003.0430411056. The cubic root of 81054784 is about 432.7723950354.

The spelling of 81054784 in words is "eighty-one million, fifty-four thousand, seven hundred eighty-four".