76781065440 has 96 divisors (see below), whose sum is σ = 242018443296. Its totient is φ = 20461568000.

The previous prime is 76781065399. The next prime is 76781065481. The reversal of 76781065440 is 4456018767.

It is an interprime number because it is at equal distance from previous prime (76781065399) and next prime (76781065481).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 76781065440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 693940 + ... + 796940.

It is an arithmetic number, because the mean of its divisors is an integer number (2521025451).

Almost surely, 2^76781065440 is an apocalyptic number.

It is an amenable number.

76781065440 is an abundant number, since it is smaller than the sum of its proper divisors (165237377856).

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

76781065440 is a wasteful number, since it uses less digits than its factorization.

76781065440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104572 (or 104564 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 76781065440 in words is "seventy-six billion, seven hundred eighty-one million, sixty-five thousand, four hundred forty".