81983252 has 48 divisors (see below), whose sum is σ = 163934400. Its totient is φ = 35773920.

The previous prime is 81983249. The next prime is 81983263. The reversal of 81983252 is 25238918.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

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, 166727 + ... + 167217.

It is an arithmetic number, because the mean of its divisors is an integer number (3415300).

Almost surely, 2^81983252 is an apocalyptic number.

It is an amenable number.

81983252 is a deficient number, since it is larger than the sum of its proper divisors (81951148).

81983252 is a wasteful number, since it uses less digits than its factorization.

81983252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553 (or 525 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 81983252 is about 9054.4603373144. The cubic root of 81983252 is about 434.4185687678.

The spelling of 81983252 in words is "eighty-one million, nine hundred eighty-three thousand, two hundred fifty-two".