81522968 has 16 divisors (see below), whose sum is σ = 152972280. Its totient is φ = 40730368.

The previous prime is 81522923. The next prime is 81522989. The reversal of 81522968 is 86922518.

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, 10280 + ... + 16392.

Almost surely, 2^81522968 is an apocalyptic number.

It is an amenable number.

81522968 is a deficient number, since it is larger than the sum of its proper divisors (71449312).

81522968 is a wasteful number, since it uses less digits than its factorization.

81522968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7786 (or 7782 counting only the distinct ones).

The product of its digits is 69120, while the sum is 41.

The square root of 81522968 is about 9029.0070328913. The cubic root of 81522968 is about 433.6040475424.

The spelling of 81522968 in words is "eighty-one million, five hundred twenty-two thousand, nine hundred sixty-eight".