7748864656 has 160 divisors (see below), whose sum is σ = 17806860288. Its totient is φ = 3232604160.

The previous prime is 7748864621. The next prime is 7748864671. The reversal of 7748864656 is 6564688477.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7748864594 and 7748864603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24444210 + ... + 24444526.

Almost surely, 2^7748864656 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 7748864656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8903430144).

7748864656 is an abundant number, since it is smaller than the sum of its proper divisors (10057995632).

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

7748864656 is a wasteful number, since it uses less digits than its factorization.

7748864656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609 (or 603 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 61.

The square root of 7748864656 is about 88027.6357515070. The cubic root of 7748864656 is about 1978.8491642394.

The spelling of 7748864656 in words is "seven billion, seven hundred forty-eight million, eight hundred sixty-four thousand, six hundred fifty-six".