81524308 has 6 divisors (see below), whose sum is σ = 142667546. Its totient is φ = 40762152.

The previous prime is 81524257. The next prime is 81524309. The reversal of 81524308 is 80342518.

It can be written as a sum of positive squares in only one way, i.e., 62758084 + 18766224 = 7922^2 + 4332^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81524308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81524309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190535 + ... + 10190542.

Almost surely, 2^81524308 is an apocalyptic number.

It is an amenable number.

81524308 is a deficient number, since it is larger than the sum of its proper divisors (61143238).

81524308 is a wasteful number, since it uses less digits than its factorization.

81524308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20381081 (or 20381079 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 81524308 is about 9029.0812378669. The cubic root of 81524308 is about 433.6064232583.

The spelling of 81524308 in words is "eighty-one million, five hundred twenty-four thousand, three hundred eight".