81173204 has 36 divisors (see below), whose sum is σ = 170955540. Its totient is φ = 33586560.

The previous prime is 81173201. The next prime is 81173237. The reversal of 81173204 is 40237118.

It can be written as a sum of positive squares in 2 ways, for example, as 12945604 + 68227600 = 3598^2 + 8260^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81173201) 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, 1457 + ... + 12824.

It is an arithmetic number, because the mean of its divisors is an integer number (4748765).

Almost surely, 2^81173204 is an apocalyptic number.

It is an amenable number.

81173204 is an abundant number, since it is smaller than the sum of its proper divisors (89782336).

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

81173204 is a wasteful number, since it uses less digits than its factorization.

81173204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14328 (or 14319 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 81173204 is about 9009.6173059681. The cubic root of 81173204 is about 432.9830507867.

The spelling of 81173204 in words is "eighty-one million, one hundred seventy-three thousand, two hundred four".