76878611644 has 24 divisors (see below), whose sum is σ = 137020247280. Its totient is φ = 37731897216.

The previous prime is 76878611629. The next prime is 76878611647. The reversal of 76878611644 is 44611687867.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76878611647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80817 + ... + 400360.

It is an arithmetic number, because the mean of its divisors is an integer number (5709176970).

Almost surely, 2^76878611644 is an apocalyptic number.

It is an amenable number.

76878611644 is a deficient number, since it is larger than the sum of its proper divisors (60141635636).

76878611644 is a wasteful number, since it uses less digits than its factorization.

76878611644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481917 (or 481915 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 58.

The spelling of 76878611644 in words is "seventy-six billion, eight hundred seventy-eight million, six hundred eleven thousand, six hundred forty-four".