81772134 has 16 divisors (see below), whose sum is σ = 163632960. Its totient is φ = 27242600.

The previous prime is 81772129. The next prime is 81772157. The reversal of 81772134 is 43127718.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81772095 and 81772104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19309 + ... + 23159.

It is an arithmetic number, because the mean of its divisors is an integer number (10227060).

Almost surely, 2^81772134 is an apocalyptic number.

81772134 is an abundant number, since it is smaller than the sum of its proper divisors (81860826).

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

81772134 is a wasteful number, since it uses less digits than its factorization.

81772134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7395.

The product of its digits is 9408, while the sum is 33.

The square root of 81772134 is about 9042.7945901696. The cubic root of 81772134 is about 434.0453526334.

The spelling of 81772134 in words is "eighty-one million, seven hundred seventy-two thousand, one hundred thirty-four".