81499794 has 16 divisors (see below), whose sum is σ = 163403040. Its totient is φ = 27099360.

The previous prime is 81499783. The next prime is 81499801. The reversal of 81499794 is 49799418.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14152 + ... + 19059.

It is an arithmetic number, because the mean of its divisors is an integer number (10212690).

Almost surely, 2^81499794 is an apocalyptic number.

81499794 is an abundant number, since it is smaller than the sum of its proper divisors (81903246).

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

81499794 is a wasteful number, since it uses less digits than its factorization.

81499794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33625.

The product of its digits is 653184, while the sum is 51.

The square root of 81499794 is about 9027.7236333419. The cubic root of 81499794 is about 433.5629577214.

The spelling of 81499794 in words is "eighty-one million, four hundred ninety-nine thousand, seven hundred ninety-four".