81210968 has 32 divisors (see below), whose sum is σ = 156149760. Its totient is φ = 39584160.

The previous prime is 81210923. The next prime is 81210977. The reversal of 81210968 is 86901218.

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, 54473 + ... + 55943.

It is an arithmetic number, because the mean of its divisors is an integer number (4879680).

Almost surely, 2^81210968 is an apocalyptic number.

It is an amenable number.

81210968 is a deficient number, since it is larger than the sum of its proper divisors (74938792).

81210968 is a wasteful number, since it uses less digits than its factorization.

81210968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647 (or 1643 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 81210968 is about 9011.7128227657. The cubic root of 81210968 is about 433.0501855722.

The spelling of 81210968 in words is "eighty-one million, two hundred ten thousand, nine hundred sixty-eight".