81374132 has 48 divisors (see below), whose sum is σ = 169128960. Its totient is φ = 33523200.

The previous prime is 81374129. The next prime is 81374147. The reversal of 81374132 is 23147318.

Its product of digits (4032) is a multiple of the sum of its prime factors (672).

It is a junction number, because it is equal to n+sod(n) for n = 81374095 and 81374104.

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, 208994 + ... + 209382.

It is an arithmetic number, because the mean of its divisors is an integer number (3523520).

Almost surely, 2^81374132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81374132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84564480).

81374132 is an abundant number, since it is smaller than the sum of its proper divisors (87754828).

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

81374132 is a wasteful number, since it uses less digits than its factorization.

81374132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 670 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 81374132 is about 9020.7611652233. The cubic root of 81374132 is about 433.3400106795.

The spelling of 81374132 in words is "eighty-one million, three hundred seventy-four thousand, one hundred thirty-two".