7778224656 has 120 divisors (see below), whose sum is σ = 22443218304. Its totient is φ = 2512892160.

The previous prime is 7778224639. The next prime is 7778224673. The reversal of 7778224656 is 6564228777.

It is an interprime number because it is at equal distance from previous prime (7778224639) and next prime (7778224673).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1441195 + ... + 1446581.

Almost surely, 2^7778224656 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 7778224656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11221609152).

7778224656 is an abundant number, since it is smaller than the sum of its proper divisors (14664993648).

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

7778224656 is a wasteful number, since it uses less digits than its factorization.

7778224656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5709 (or 5700 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 54.

The square root of 7778224656 is about 88194.2438938052. The cubic root of 7778224656 is about 1981.3452627078.

The spelling of 7778224656 in words is "seven billion, seven hundred seventy-eight million, two hundred twenty-four thousand, six hundred fifty-six".