656609448 has 128 divisors (see below), whose sum is σ = 1910016000. Its totient is φ = 186001920.

The previous prime is 656609413. The next prime is 656609449. The reversal of 656609448 is 844906656.

It is a happy number.

It is a super-2 number, since 2×656609448² = 862271934405729408, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 656609397 and 656609406.

It is not an unprimeable number, because it can be changed into a prime (656609449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 395436 + ... + 397092.

It is an arithmetic number, because the mean of its divisors is an integer number (14922000).

Almost surely, 2^656609448 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 656609448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955008000).

656609448 is an abundant number, since it is smaller than the sum of its proper divisors (1253406552).

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

656609448 is a wasteful number, since it uses less digits than its factorization.

656609448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775 (or 1771 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 656609448 is about 25624.3916610717. The cubic root of 656609448 is about 869.1652926850.

The spelling of 656609448 in words is "six hundred fifty-six million, six hundred nine thousand, four hundred forty-eight".