81369392 has 20 divisors (see below), whose sum is σ = 169780800. Its totient is φ = 37555008.

The previous prime is 81369391. The next prime is 81369397. The reversal of 81369392 is 29396318.

It is not an unprimeable number, because it can be changed into a prime (81369391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195392 + ... + 195807.

It is an arithmetic number, because the mean of its divisors is an integer number (8489040).

Almost surely, 2^81369392 is an apocalyptic number.

It is an amenable number.

81369392 is an abundant number, since it is smaller than the sum of its proper divisors (88411408).

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

81369392 is a wasteful number, since it uses less digits than its factorization.

81369392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391220 (or 391214 counting only the distinct ones).

The product of its digits is 69984, while the sum is 41.

The square root of 81369392 is about 9020.4984341221. The cubic root of 81369392 is about 433.3315965742.

The spelling of 81369392 in words is "eighty-one million, three hundred sixty-nine thousand, three hundred ninety-two".