81618276 has 12 divisors (see below), whose sum is σ = 190442672. Its totient is φ = 27206088.

The previous prime is 81618259. The next prime is 81618293. The reversal of 81618276 is 67281618.

It is an interprime number because it is at equal distance from previous prime (81618259) and next prime (81618293).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3400750 + ... + 3400773.

Almost surely, 2^81618276 is an apocalyptic number.

It is an amenable number.

81618276 is an abundant number, since it is smaller than the sum of its proper divisors (108824396).

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

81618276 is a wasteful number, since it uses less digits than its factorization.

81618276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801530 (or 6801528 counting only the distinct ones).

The product of its digits is 32256, while the sum is 39.

The square root of 81618276 is about 9034.2833694765. The cubic root of 81618276 is about 433.7729563436.

The spelling of 81618276 in words is "eighty-one million, six hundred eighteen thousand, two hundred seventy-six".