81952864 has 48 divisors (see below), whose sum is σ = 192423168. Its totient is φ = 33593472.

The previous prime is 81952853. The next prime is 81952867. The reversal of 81952864 is 46825918.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81952864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81952867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2802 + ... + 13105.

It is an arithmetic number, because the mean of its divisors is an integer number (4008816).

Almost surely, 2^81952864 is an apocalyptic number.

It is an amenable number.

81952864 is an abundant number, since it is smaller than the sum of its proper divisors (110470304).

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

81952864 is a wasteful number, since it uses less digits than its factorization.

81952864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15947 (or 15939 counting only the distinct ones).

The product of its digits is 138240, while the sum is 43.

The square root of 81952864 is about 9052.7821138035. The cubic root of 81952864 is about 434.3648881175.

The spelling of 81952864 in words is "eighty-one million, nine hundred fifty-two thousand, eight hundred sixty-four".