81747376 has 10 divisors (see below), whose sum is σ = 158385572. Its totient is φ = 40873680.

The previous prime is 81747349. The next prime is 81747377. The reversal of 81747376 is 67374718.

It is not an unprimeable number, because it can be changed into a prime (81747377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2554590 + ... + 2554621.

Almost surely, 2^81747376 is an apocalyptic number.

It is an amenable number.

81747376 is a deficient number, since it is larger than the sum of its proper divisors (76638196).

81747376 is a wasteful number, since it uses less digits than its factorization.

81747376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5109219 (or 5109213 counting only the distinct ones).

The product of its digits is 197568, while the sum is 43.

The square root of 81747376 is about 9041.4255513166. The cubic root of 81747376 is about 434.0015431716.

The spelling of 81747376 in words is "eighty-one million, seven hundred forty-seven thousand, three hundred seventy-six".