778572660 has 96 divisors (see below), whose sum is σ = 2216253312. Its totient is φ = 204198400.

The previous prime is 778572649. The next prime is 778572661. The reversal of 778572660 is 66275877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778572661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1110310 + ... + 1111010.

It is an arithmetic number, because the mean of its divisors is an integer number (23085972).

Almost surely, 2^778572660 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 778572660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1108126656).

778572660 is an abundant number, since it is smaller than the sum of its proper divisors (1437680652).

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

778572660 is a wasteful number, since it uses less digits than its factorization.

778572660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 993 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 48.

The square root of 778572660 is about 27902.9149014937. The cubic root of 778572660 is about 919.9545740016.

The spelling of 778572660 in words is "seven hundred seventy-eight million, five hundred seventy-two thousand, six hundred sixty".