81007922232 has 128 divisors (see below), whose sum is σ = 239013633600. Its totient is φ = 25333714944.

The previous prime is 81007922213. The next prime is 81007922251. The reversal of 81007922232 is 23222970018.

It is an interprime number because it is at equal distance from previous prime (81007922213) and next prime (81007922251).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1129228 + ... + 1198820.

Almost surely, 2^81007922232 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 81007922232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119506816800).

81007922232 is an abundant number, since it is smaller than the sum of its proper divisors (158005711368).

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

81007922232 is a wasteful number, since it uses less digits than its factorization.

81007922232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69942 (or 69932 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 81007922232 in words is "eighty-one billion, seven million, nine hundred twenty-two thousand, two hundred thirty-two".