81216876 has 24 divisors (see below), whose sum is σ = 204083824. Its totient is φ = 24989760.

The previous prime is 81216857. The next prime is 81216899. The reversal of 81216876 is 67861218.

It is a Harshad number since it is a multiple of its sum of digits (39).

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, 260155 + ... + 260466.

Almost surely, 2^81216876 is an apocalyptic number.

It is an amenable number.

81216876 is an abundant number, since it is smaller than the sum of its proper divisors (122866948).

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

81216876 is a wasteful number, since it uses less digits than its factorization.

81216876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520641 (or 520639 counting only the distinct ones).

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

The square root of 81216876 is about 9012.0406124251. The cubic root of 81216876 is about 433.0606866105.

The spelling of 81216876 in words is "eighty-one million, two hundred sixteen thousand, eight hundred seventy-six".