7780793664 has 224 divisors, whose sum is σ = 25567436800. Its totient is φ = 2037934080.

The previous prime is 7780793651. The next prime is 7780793701. The reversal of 7780793664 is 4663970877.

It is a tau number, because it is divible by the number of its divisors (224).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 786702 + ... + 796530.

Almost surely, 2^7780793664 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 7780793664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12783718400).

7780793664 is an abundant number, since it is smaller than the sum of its proper divisors (17786643136).

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

7780793664 is a wasteful number, since it uses less digits than its factorization.

7780793664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9901 (or 9891 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 57.

The square root of 7780793664 is about 88208.8071793288. The cubic root of 7780793664 is about 1981.5633729566.

The spelling of 7780793664 in words is "seven billion, seven hundred eighty million, seven hundred ninety-three thousand, six hundred sixty-four".