81248964 has 24 divisors (see below), whose sum is σ = 190401120. Its totient is φ = 26965824.

The previous prime is 81248953. The next prime is 81248977. The reversal of 81248964 is 46984218.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11734 + ... + 17325.

It is an arithmetic number, because the mean of its divisors is an integer number (7933380).

Almost surely, 2^81248964 is an apocalyptic number.

It is an amenable number.

81248964 is an abundant number, since it is smaller than the sum of its proper divisors (109152156).

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

81248964 is a wasteful number, since it uses less digits than its factorization.

81248964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29299 (or 29297 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 81248964 is about 9013.8207215365. The cubic root of 81248964 is about 433.1177117935.

The spelling of 81248964 in words is "eighty-one million, two hundred forty-eight thousand, nine hundred sixty-four".