81818152 has 32 divisors (see below), whose sum is σ = 165876480. Its totient is φ = 37609920.

The previous prime is 81818147. The next prime is 81818173. The reversal of 81818152 is 25181818.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26733 + ... + 29635.

It is an arithmetic number, because the mean of its divisors is an integer number (5183640).

Almost surely, 2^81818152 is an apocalyptic number.

It is an amenable number.

81818152 is an abundant number, since it is smaller than the sum of its proper divisors (84058328).

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

81818152 is a wasteful number, since it uses less digits than its factorization.

81818152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193 (or 3189 counting only the distinct ones).

The product of its digits is 5120, while the sum is 34.

The square root of 81818152 is about 9045.3386890707. The cubic root of 81818152 is about 434.1267583332.

The spelling of 81818152 in words is "eighty-one million, eight hundred eighteen thousand, one hundred fifty-two".