81799952 has 80 divisors (see below), whose sum is σ = 179988480. Its totient is φ = 35750400.

The previous prime is 81799897. The next prime is 81799973. The reversal of 81799952 is 25999718.

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 81799952.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 428177 + ... + 428367.

It is an arithmetic number, because the mean of its divisors is an integer number (2249856).

Almost surely, 2^81799952 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81799952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89994240).

81799952 is an abundant number, since it is smaller than the sum of its proper divisors (98188528).

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

81799952 is a wasteful number, since it uses less digits than its factorization.

81799952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 306 counting only the distinct ones).

The product of its digits is 408240, while the sum is 50.

The square root of 81799952 is about 9044.3325900809. The cubic root of 81799952 is about 434.0945662392.

The spelling of 81799952 in words is "eighty-one million, seven hundred ninety-nine thousand, nine hundred fifty-two".