81760392 has 96 divisors (see below), whose sum is σ = 261281280. Its totient is φ = 22602240.

The previous prime is 81760381. The next prime is 81760403. The reversal of 81760392 is 29306718.

It is an interprime number because it is at equal distance from previous prime (81760381) and next prime (81760403).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

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, 13008 + ... + 18240.

It is an arithmetic number, because the mean of its divisors is an integer number (2721680).

Almost surely, 2^81760392 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 81760392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130640640).

81760392 is an abundant number, since it is smaller than the sum of its proper divisors (179520888).

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

81760392 is a wasteful number, since it uses less digits than its factorization.

81760392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5283 (or 5276 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 81760392 is about 9042.1453206637. The cubic root of 81760392 is about 434.0245761813.

The spelling of 81760392 in words is "eighty-one million, seven hundred sixty thousand, three hundred ninety-two".