81658968 has 64 divisors (see below), whose sum is σ = 209141760. Its totient is φ = 26562816.

The previous prime is 81658949. The next prime is 81658999. The reversal of 81658968 is 86985618.

Its product of digits (829440) is a multiple of the sum of its prime factors (576).

It is a self number, because there is not a number n which added to its sum of digits gives 81658968.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222321 + ... + 222687.

It is an arithmetic number, because the mean of its divisors is an integer number (3267840).

Almost surely, 2^81658968 is an apocalyptic number.

It is an amenable number.

81658968 is an abundant number, since it is smaller than the sum of its proper divisors (127482792).

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

81658968 is a wasteful number, since it uses less digits than its factorization.

81658968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576 (or 572 counting only the distinct ones).

The product of its digits is 829440, while the sum is 51.

The square root of 81658968 is about 9036.5351767146. The cubic root of 81658968 is about 433.8450323434.

The spelling of 81658968 in words is "eighty-one million, six hundred fifty-eight thousand, nine hundred sixty-eight".