81992088 has 112 divisors (see below), whose sum is σ = 244351080. Its totient is φ = 25691904.

The previous prime is 81992083. The next prime is 81992093. The reversal of 81992088 is 88029918.

It is an interprime number because it is at equal distance from previous prime (81992083) and next prime (81992093).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81992081) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 98731 + ... + 99557.

Almost surely, 2^81992088 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 81992088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122175540).

81992088 is an abundant number, since it is smaller than the sum of its proper divisors (162358992).

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

81992088 is a wasteful number, since it uses less digits than its factorization.

81992088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 81992088 is about 9054.9482604817. The cubic root of 81992088 is about 434.4341751447.

The spelling of 81992088 in words is "eighty-one million, nine hundred ninety-two thousand, eighty-eight".