81068372 has 24 divisors (see below), whose sum is σ = 176877120. Its totient is φ = 31584960.

The previous prime is 81068333. The next prime is 81068381. The reversal of 81068372 is 27386018.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 131297 + ... + 131912.

It is an arithmetic number, because the mean of its divisors is an integer number (7369880).

Almost surely, 2^81068372 is an apocalyptic number.

It is an amenable number.

81068372 is an abundant number, since it is smaller than the sum of its proper divisors (95808748).

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

81068372 is a wasteful number, since it uses less digits than its factorization.

81068372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263231 (or 263229 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 81068372 is about 9003.7976432170. The cubic root of 81068372 is about 432.7965769629.

The spelling of 81068372 in words is "eighty-one million, sixty-eight thousand, three hundred seventy-two".