81653952 has 28 divisors (see below), whose sum is σ = 216043256. Its totient is φ = 27217920.

The previous prime is 81653951. The next prime is 81653953. The reversal of 81653952 is 25935618.

It is an interprime number because it is at equal distance from previous prime (81653951) and next prime (81653953).

It is a self number, because there is not a number n which added to its sum of digits gives 81653952.

It is not an unprimeable number, because it can be changed into a prime (81653951) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 212449 + ... + 212832.

Almost surely, 2^81653952 is an apocalyptic number.

It is an amenable number.

81653952 is an abundant number, since it is smaller than the sum of its proper divisors (134389304).

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

81653952 is a wasteful number, since it uses less digits than its factorization.

81653952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425296 (or 425286 counting only the distinct ones).

The product of its digits is 64800, while the sum is 39.

The square root of 81653952 is about 9036.2576324494. The cubic root of 81653952 is about 433.8361490111.

The spelling of 81653952 in words is "eighty-one million, six hundred fifty-three thousand, nine hundred fifty-two".