81698722 has 16 divisors (see below), whose sum is σ = 140792832. Its totient is φ = 34829280.

The previous prime is 81698711. The next prime is 81698741. The reversal of 81698722 is 22789618.

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, 12603 + ... + 17950.

It is an arithmetic number, because the mean of its divisors is an integer number (8799552).

Almost surely, 2^81698722 is an apocalyptic number.

81698722 is a deficient number, since it is larger than the sum of its proper divisors (59094110).

81698722 is a wasteful number, since it uses less digits than its factorization.

81698722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30753.

The product of its digits is 96768, while the sum is 43.

The square root of 81698722 is about 9038.7345353207. The cubic root of 81698722 is about 433.9154237848.

The spelling of 81698722 in words is "eighty-one million, six hundred ninety-eight thousand, seven hundred twenty-two".