81394692 has 24 divisors (see below), whose sum is σ = 190092000. Its totient is φ = 27107136.

The previous prime is 81394669. The next prime is 81394721. The reversal of 81394692 is 29649318.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15184 + ... + 19832.

It is an arithmetic number, because the mean of its divisors is an integer number (7920500).

Almost surely, 2^81394692 is an apocalyptic number.

It is an amenable number.

81394692 is an abundant number, since it is smaller than the sum of its proper divisors (108697308).

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

81394692 is a wasteful number, since it uses less digits than its factorization.

81394692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6115 (or 6113 counting only the distinct ones).

The product of its digits is 93312, while the sum is 42.

The square root of 81394692 is about 9021.9006866624. The cubic root of 81394692 is about 433.3765035229.

The spelling of 81394692 in words is "eighty-one million, three hundred ninety-four thousand, six hundred ninety-two".