81372318 has 16 divisors (see below), whose sum is σ = 168356880. Its totient is φ = 26188736.

The previous prime is 81372311. The next prime is 81372349. The reversal of 81372318 is 81327318.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81372311) 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, 233655 + ... + 234002.

It is an arithmetic number, because the mean of its divisors is an integer number (10522305).

Almost surely, 2^81372318 is an apocalyptic number.

81372318 is an abundant number, since it is smaller than the sum of its proper divisors (86984562).

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

81372318 is a wasteful number, since it uses less digits than its factorization.

81372318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467691.

The product of its digits is 8064, while the sum is 33.

The square root of 81372318 is about 9020.6606188239. The cubic root of 81372318 is about 433.3367906365.

The spelling of 81372318 in words is "eighty-one million, three hundred seventy-two thousand, three hundred eighteen".