81174830 has 64 divisors (see below), whose sum is σ = 171134208. Its totient is φ = 27394560.

The previous prime is 81174827. The next prime is 81174869. The reversal of 81174830 is 3847118.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154949 + ... + 155471.

It is an arithmetic number, because the mean of its divisors is an integer number (2673972).

Almost surely, 2^81174830 is an apocalyptic number.

81174830 is an abundant number, since it is smaller than the sum of its proper divisors (89959378).

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

81174830 is a wasteful number, since it uses less digits than its factorization.

81174830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 81174830 is about 9009.7075424233. The cubic root of 81174830 is about 432.9859418300.

The spelling of 81174830 in words is "eighty-one million, one hundred seventy-four thousand, eight hundred thirty".