81524268 has 36 divisors (see below), whose sum is σ = 235515280. Its totient is φ = 23292576.

The previous prime is 81524257. The next prime is 81524309. The reversal of 81524268 is 86242518.

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 an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161503 + ... + 162006.

Almost surely, 2^81524268 is an apocalyptic number.

It is an amenable number.

81524268 is an abundant number, since it is smaller than the sum of its proper divisors (153991012).

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

81524268 is a wasteful number, since it uses less digits than its factorization.

81524268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323526 (or 323521 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 81524268 is about 9029.0790228018. The cubic root of 81524268 is about 433.6063523418.

The spelling of 81524268 in words is "eighty-one million, five hundred twenty-four thousand, two hundred sixty-eight".