791779664 has 40 divisors (see below), whose sum is σ = 1658039712. Its totient is φ = 364118400.

The previous prime is 791779657. The next prime is 791779679. The reversal of 791779664 is 466977197.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52139 + ... + 65589.

Almost surely, 2^791779664 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 791779664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829019856).

791779664 is an abundant number, since it is smaller than the sum of its proper divisors (866260048).

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

791779664 is a wasteful number, since it uses less digits than its factorization.

791779664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13755 (or 13749 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 56.

The square root of 791779664 is about 28138.5796372169. The cubic root of 791779664 is about 925.1271951701.

The spelling of 791779664 in words is "seven hundred ninety-one million, seven hundred seventy-nine thousand, six hundred sixty-four".