81174736 has 10 divisors (see below), whose sum is σ = 157276082. Its totient is φ = 40587360.

The previous prime is 81174727. The next prime is 81174739. The reversal of 81174736 is 63747118.

It can be written as a sum of positive squares in only one way, i.e., 78216336 + 2958400 = 8844^2 + 1720^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81174695 and 81174704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81174739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2536695 + ... + 2536726.

Almost surely, 2^81174736 is an apocalyptic number.

It is an amenable number.

81174736 is a deficient number, since it is larger than the sum of its proper divisors (76101346).

81174736 is a wasteful number, since it uses less digits than its factorization.

81174736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5073429 (or 5073423 counting only the distinct ones).

The product of its digits is 28224, while the sum is 37.

The square root of 81174736 is about 9009.7023258263. The cubic root of 81174736 is about 432.9857746981.

The spelling of 81174736 in words is "eighty-one million, one hundred seventy-four thousand, seven hundred thirty-six".