7647728920 has 32 divisors (see below), whose sum is σ = 18531036720. Its totient is φ = 2823776640.

The previous prime is 7647728917. The next prime is 7647728941. The reversal of 7647728920 is 298277467.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 7353066 + ... + 7354105.

Almost surely, 2^7647728920 is an apocalyptic number.

It is an amenable number.

7647728920 is an abundant number, since it is smaller than the sum of its proper divisors (10883307800).

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

7647728920 is a wasteful number, since it uses less digits than its factorization.

7647728920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14707195 (or 14707191 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 52.

The square root of 7647728920 is about 87451.2945587428. The cubic root of 7647728920 is about 1970.2023309069.

The spelling of 7647728920 in words is "seven billion, six hundred forty-seven million, seven hundred twenty-eight thousand, nine hundred twenty".