81774324 has 36 divisors (see below), whose sum is σ = 206983140. Its totient is φ = 27221760.

The previous prime is 81774317. The next prime is 81774331. The reversal of 81774324 is 42347718.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81774317) and next prime (81774331).

It can be written as a sum of positive squares in 2 ways, for example, as 27751824 + 54022500 = 5268^2 + 7350^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48162 + ... + 49830.

Almost surely, 2^81774324 is an apocalyptic number.

It is an amenable number.

81774324 is an abundant number, since it is smaller than the sum of its proper divisors (125208816).

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

81774324 is a wasteful number, since it uses less digits than its factorization.

81774324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040 (or 3035 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 81774324 is about 9042.9156802438. The cubic root of 81774324 is about 434.0492274287.

The spelling of 81774324 in words is "eighty-one million, seven hundred seventy-four thousand, three hundred twenty-four".