7908661720 has 32 divisors (see below), whose sum is σ = 18368507520. Its totient is φ = 3061416960.

The previous prime is 7908661703. The next prime is 7908661721. The reversal of 7908661720 is 271668097.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7908661721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3187737 + ... + 3190216.

It is an arithmetic number, because the mean of its divisors is an integer number (574015860).

Almost surely, 2^7908661720 is an apocalyptic number.

It is an amenable number.

7908661720 is an abundant number, since it is smaller than the sum of its proper divisors (10459845800).

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

7908661720 is a wasteful number, since it uses less digits than its factorization.

7908661720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6377995 (or 6377991 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 7908661720 is about 88930.6568063005. The cubic root of 7908661720 is about 1992.3593238727.

The spelling of 7908661720 in words is "seven billion, nine hundred eight million, six hundred sixty-one thousand, seven hundred twenty".