81632976 has 20 divisors (see below), whose sum is σ = 210885312. Its totient is φ = 27210976.

The previous prime is 81632923. The next prime is 81632977. The reversal of 81632976 is 67923618.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81632977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850296 + ... + 850391.

Almost surely, 2^81632976 is an apocalyptic number.

It is an amenable number.

81632976 is an abundant number, since it is smaller than the sum of its proper divisors (129252336).

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

81632976 is a wasteful number, since it uses less digits than its factorization.

81632976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700698 (or 1700692 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 81632976 is about 9035.0969004212. The cubic root of 81632976 is about 433.7989965884.

The spelling of 81632976 in words is "eighty-one million, six hundred thirty-two thousand, nine hundred seventy-six".