776372256640 has 128 divisors (see below), whose sum is σ = 1862162265600. Its totient is φ = 309522352128.

The previous prime is 776372256587. The next prime is 776372256677. The reversal of 776372256640 is 46652273677.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301034871 + ... + 301037449.

It is an arithmetic number, because the mean of its divisors is an integer number (14548142700).

Almost surely, 2^776372256640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 776372256640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931081132800).

776372256640 is an abundant number, since it is smaller than the sum of its proper divisors (1085790008960).

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

776372256640 is a wasteful number, since it uses less digits than its factorization.

776372256640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972 (or 3960 counting only the distinct ones).

The product of its (nonzero) digits is 17781120, while the sum is 55.

The spelling of 776372256640 in words is "seven hundred seventy-six billion, three hundred seventy-two million, two hundred fifty-six thousand, six hundred forty".