81352992 has 48 divisors (see below), whose sum is σ = 244060992. Its totient is φ = 23243520.

The previous prime is 81352981. The next prime is 81353011. The reversal of 81352992 is 29925318.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 81352992.

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 7 ways as a sum of consecutive naturals, for example, 59859 + ... + 61202.

It is an arithmetic number, because the mean of its divisors is an integer number (5084604).

Almost surely, 2^81352992 is an apocalyptic number.

It is an amenable number.

81352992 is an abundant number, since it is smaller than the sum of its proper divisors (162708000).

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

81352992 is a wasteful number, since it uses less digits than its factorization.

81352992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121081 (or 121073 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 81352992 is about 9019.5893476366. The cubic root of 81352992 is about 433.3024819587.

The spelling of 81352992 in words is "eighty-one million, three hundred fifty-two thousand, nine hundred ninety-two".