656128280 has 64 divisors (see below), whose sum is σ = 1508855040. Its totient is φ = 256726912.

The previous prime is 656128267. The next prime is 656128283. The reversal of 656128280 is 82821656.

656128280 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656128283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 354317 + ... + 356163.

It is an arithmetic number, because the mean of its divisors is an integer number (23575860).

Almost surely, 2^656128280 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 656128280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (754427520).

656128280 is an abundant number, since it is smaller than the sum of its proper divisors (852726760).

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

656128280 is a wasteful number, since it uses less digits than its factorization.

656128280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048 (or 2044 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 656128280 is about 25615.0010735897. The cubic root of 656128280 is about 868.9529306661.

The spelling of 656128280 in words is "six hundred fifty-six million, one hundred twenty-eight thousand, two hundred eighty".