81178368 has 36 divisors (see below), whose sum is σ = 216054888. Its totient is φ = 27059200.

The previous prime is 81178343. The next prime is 81178379. The reversal of 81178368 is 86387118.

It is a super-2 number, since 2×81178368² = 13179854862286848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52083 + ... + 53618.

Almost surely, 2^81178368 is an apocalyptic number.

It is an amenable number.

81178368 is an abundant number, since it is smaller than the sum of its proper divisors (134876520).

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

81178368 is a wasteful number, since it uses less digits than its factorization.

81178368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105720 (or 105706 counting only the distinct ones).

The product of its digits is 64512, while the sum is 42.

The square root of 81178368 is about 9009.9038840600. The cubic root of 81178368 is about 432.9922322938.

The spelling of 81178368 in words is "eighty-one million, one hundred seventy-eight thousand, three hundred sixty-eight".