81119952 has 60 divisors (see below), whose sum is σ = 227722404. Its totient is φ = 26956800.

The previous prime is 81119939. The next prime is 81119953. The reversal of 81119952 is 25991118.

It can be written as a sum of positive squares in 2 ways, for example, as 2903616 + 78216336 = 1704^2 + 8844^2 .

It is a super-2 number, since 2×81119952² = 13160893224964608, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81119953) 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 11 ways as a sum of consecutive naturals, for example, 61702 + ... + 63002.

Almost surely, 2^81119952 is an apocalyptic number.

It is an amenable number.

81119952 is an abundant number, since it is smaller than the sum of its proper divisors (146602452).

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

81119952 is a wasteful number, since it uses less digits than its factorization.

81119952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1748 (or 1739 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 81119952 is about 9006.6615346642. The cubic root of 81119952 is about 432.8883468853. Note that the first 3 decimals are identical.

The spelling of 81119952 in words is "eighty-one million, one hundred nineteen thousand, nine hundred fifty-two".