81219376 has 40 divisors (see below), whose sum is σ = 189313280. Its totient is φ = 32975424.

The previous prime is 81219367. The next prime is 81219407. The reversal of 81219376 is 67391218.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16956 + ... + 21211.

It is an arithmetic number, because the mean of its divisors is an integer number (4732832).

Almost surely, 2^81219376 is an apocalyptic number.

It is an amenable number.

81219376 is an abundant number, since it is smaller than the sum of its proper divisors (108093904).

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

81219376 is a wasteful number, since it uses less digits than its factorization.

81219376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38201 (or 38195 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 81219376 is about 9012.1793146830. The cubic root of 81219376 is about 433.0651300245.

The spelling of 81219376 in words is "eighty-one million, two hundred nineteen thousand, three hundred seventy-six".