81239274 has 24 divisors (see below), whose sum is σ = 182538720. Its totient is φ = 27079596.

The previous prime is 81239273. The next prime is 81239287. The reversal of 81239274 is 47293218.

It is not an unprimeable number, because it can be changed into a prime (81239273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83094 + ... + 84065.

It is an arithmetic number, because the mean of its divisors is an integer number (7605780).

Almost surely, 2^81239274 is an apocalyptic number.

81239274 is an abundant number, since it is smaller than the sum of its proper divisors (101299446).

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

81239274 is a wasteful number, since it uses less digits than its factorization.

81239274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167176 (or 167164 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 81239274 is about 9013.2831975923. The cubic root of 81239274 is about 433.1004927945.

The spelling of 81239274 in words is "eighty-one million, two hundred thirty-nine thousand, two hundred seventy-four".