81988676 has 72 divisors (see below), whose sum is σ = 185508288. Its totient is φ = 30801600.

The previous prime is 81988661. The next prime is 81988681. The reversal of 81988676 is 67688918.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 295850 + ... + 296126.

It is an arithmetic number, because the mean of its divisors is an integer number (2576504).

Almost surely, 2^81988676 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81988676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92754144).

81988676 is an abundant number, since it is smaller than the sum of its proper divisors (103519612).

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

81988676 is a wasteful number, since it uses less digits than its factorization.

81988676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 328 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 53.

The square root of 81988676 is about 9054.7598532485. The cubic root of 81988676 is about 434.4281489130.

The spelling of 81988676 in words is "eighty-one million, nine hundred eighty-eight thousand, six hundred seventy-six".