81368698 has 32 divisors (see below), whose sum is σ = 134742528. Its totient is φ = 36691200.

The previous prime is 81368669. The next prime is 81368699. The reversal of 81368698 is 89686318.

It is not an unprimeable number, because it can be changed into a prime (81368699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88863 + ... + 89773.

It is an arithmetic number, because the mean of its divisors is an integer number (4210704).

Almost surely, 2^81368698 is an apocalyptic number.

81368698 is a deficient number, since it is larger than the sum of its proper divisors (53373830).

81368698 is a wasteful number, since it uses less digits than its factorization.

81368698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038.

The product of its digits is 497664, while the sum is 49.

The square root of 81368698 is about 9020.4599660993. The cubic root of 81368698 is about 433.3303646082.

The spelling of 81368698 in words is "eighty-one million, three hundred sixty-eight thousand, six hundred ninety-eight".