81383789460 has 72 divisors (see below), whose sum is σ = 240499306656. Its totient is φ = 20560109760.

The previous prime is 81383789447. The next prime is 81383789477. The reversal of 81383789460 is 6498738318.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 81383789460.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1857006 + ... + 1900325.

It is an arithmetic number, because the mean of its divisors is an integer number (3340268148).

Almost surely, 2^81383789460 is an apocalyptic number.

It is an amenable number.

81383789460 is an abundant number, since it is smaller than the sum of its proper divisors (159115517196).

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

81383789460 is a wasteful number, since it uses less digits than its factorization.

81383789460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3757381 (or 3757360 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 57.

The spelling of 81383789460 in words is "eighty-one billion, three hundred eighty-three million, seven hundred eighty-nine thousand, four hundred sixty".