764378864640 has 704 divisors, whose sum is σ = 2983995417600. Its totient is φ = 184695717888.

The previous prime is 764378864629. The next prime is 764378864651. The reversal of 764378864640 is 46468873467.

It is a happy number.

764378864640 is a `hidden beast` number, since 7 + 6 + 437 + 88 + 64 + 64 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (764378864629) and next prime (764378864651).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60404554 + ... + 60417206.

Almost surely, 2^764378864640 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 764378864640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1491997708800).

764378864640 is an abundant number, since it is smaller than the sum of its proper divisors (2219616552960).

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

764378864640 is a wasteful number, since it uses less digits than its factorization.

764378864640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12729 (or 12705 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 63.

The spelling of 764378864640 in words is "seven hundred sixty-four billion, three hundred seventy-eight million, eight hundred sixty-four thousand, six hundred forty".