81863284374 has 36 divisors (see below), whose sum is σ = 179644311756. Its totient is φ = 26942309784.

The previous prime is 81863284369. The next prime is 81863284397. The reversal of 81863284374 is 47348236818.

81863284374 is a `hidden beast` number, since 8 + 186 + 3 + 28 + 437 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 81863284374.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 252024 + ... + 476699.

It is an arithmetic number, because the mean of its divisors is an integer number (4990119771).

Almost surely, 2^81863284374 is an apocalyptic number.

81863284374 is an abundant number, since it is smaller than the sum of its proper divisors (97781027382).

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

81863284374 is a wasteful number, since it uses less digits than its factorization.

81863284374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728889 (or 728807 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 54.

The spelling of 81863284374 in words is "eighty-one billion, eight hundred sixty-three million, two hundred eighty-four thousand, three hundred seventy-four".