81696888 has 192 divisors, whose sum is σ = 280512960. Its totient is φ = 20901888.

The previous prime is 81696859. The next prime is 81696893. The reversal of 81696888 is 88869618.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 242256 + ... + 242592.

It is an arithmetic number, because the mean of its divisors is an integer number (1461005).

Almost surely, 2^81696888 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 81696888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140256480).

81696888 is an abundant number, since it is smaller than the sum of its proper divisors (198816072).

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

81696888 is a wasteful number, since it uses less digits than its factorization.

81696888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 399 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The square root of 81696888 is about 9038.6330824965. The cubic root of 81696888 is about 433.9121768681.

The spelling of 81696888 in words is "eighty-one million, six hundred ninety-six thousand, eight hundred eighty-eight".