81290794 has 16 divisors (see below), whose sum is σ = 131554080. Its totient is φ = 37450800.

The previous prime is 81290791. The next prime is 81290819. The reversal of 81290794 is 49709218.

It is not an unprimeable number, because it can be changed into a prime (81290791) 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, 13569 + ... + 18619.

It is an arithmetic number, because the mean of its divisors is an integer number (8222130).

Almost surely, 2^81290794 is an apocalyptic number.

81290794 is a deficient number, since it is larger than the sum of its proper divisors (50263286).

81290794 is a wasteful number, since it uses less digits than its factorization.

81290794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5685.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 81290794 is about 9016.1407486796. The cubic root of 81290794 is about 433.1920274308.

The spelling of 81290794 in words is "eighty-one million, two hundred ninety thousand, seven hundred ninety-four".