81873852 has 48 divisors (see below), whose sum is σ = 198868992. Its totient is φ = 26187840.

The previous prime is 81873851. The next prime is 81873877. The reversal of 81873852 is 25837818.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81873851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46378 + ... + 48110.

It is an arithmetic number, because the mean of its divisors is an integer number (4143104).

Almost surely, 2^81873852 is an apocalyptic number.

It is an amenable number.

81873852 is an abundant number, since it is smaller than the sum of its proper divisors (116995140).

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

81873852 is a wasteful number, since it uses less digits than its factorization.

81873852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898 (or 1896 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 81873852 is about 9048.4170991395. The cubic root of 81873852 is about 434.2252506387.

It can be divided in two parts, 81873 and 852, that multiplied together give a palindrome (69755796).

The spelling of 81873852 in words is "eighty-one million, eight hundred seventy-three thousand, eight hundred fifty-two".