81989682 has 16 divisors (see below), whose sum is σ = 164620512. Its totient is φ = 27223040.

The previous prime is 81989659. The next prime is 81989701. The reversal of 81989682 is 28698918.

It is a super-2 number, since 2×81989682² = 13444615908922248, which contains 22 as substring.

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, 25044 + ... + 28127.

It is an arithmetic number, because the mean of its divisors is an integer number (10288782).

Almost surely, 2^81989682 is an apocalyptic number.

81989682 is an abundant number, since it is smaller than the sum of its proper divisors (82630830).

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

81989682 is a wasteful number, since it uses less digits than its factorization.

81989682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53433.

The product of its digits is 497664, while the sum is 51.

The square root of 81989682 is about 9054.8154039715. The cubic root of 81989682 is about 434.4299257150.

The spelling of 81989682 in words is "eighty-one million, nine hundred eighty-nine thousand, six hundred eighty-two".