81073384 has 32 divisors (see below), whose sum is σ = 174314880. Its totient is φ = 34628544.

The previous prime is 81073381. The next prime is 81073397. The reversal of 81073384 is 48337018.

It is a super-2 number, since 2×81073384² = 13145787186422912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81073381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15469 + ... + 20035.

It is an arithmetic number, because the mean of its divisors is an integer number (5447340).

Almost surely, 2^81073384 is an apocalyptic number.

It is an amenable number.

81073384 is an abundant number, since it is smaller than the sum of its proper divisors (93241496).

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

81073384 is a wasteful number, since it uses less digits than its factorization.

81073384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4897 (or 4893 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 81073384 is about 9004.0759659168. The cubic root of 81073384 is about 432.8054959025.

The spelling of 81073384 in words is "eighty-one million, seventy-three thousand, three hundred eighty-four".