81892242 has 32 divisors (see below), whose sum is σ = 191563200. Its totient is φ = 25860384.

The previous prime is 81892241. The next prime is 81892271. The reversal of 81892242 is 24229818.

It is a junction number, because it is equal to n+sod(n) for n = 81892197 and 81892206.

It is not an unprimeable number, because it can be changed into a prime (81892241) 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, 38883 + ... + 40934.

It is an arithmetic number, because the mean of its divisors is an integer number (5986350).

Almost surely, 2^81892242 is an apocalyptic number.

81892242 is an abundant number, since it is smaller than the sum of its proper divisors (109670958).

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

81892242 is a wasteful number, since it uses less digits than its factorization.

81892242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79847 (or 79841 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 81892242 is about 9049.4332419218. The cubic root of 81892242 is about 434.2577592046.

The spelling of 81892242 in words is "eighty-one million, eight hundred ninety-two thousand, two hundred forty-two".