657448 has 32 divisors (see below), whose sum is σ = 1393920. Its totient is φ = 288000.

The previous prime is 657439. The next prime is 657451. The reversal of 657448 is 844756.

It is an unprimeable number.

657448 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2608 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (43560).

2⁶⁵⁷⁴⁴⁸ 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 657448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (696960).

657448 is an abundant number, since it is smaller than the sum of its proper divisors (736472).

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

657448 is a wasteful number, since it uses less digits than its factorization.

657448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 285 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 657448 is about 810.8316718037. The cubic root of 657448 is about 86.9535137220.

The spelling of 657448 in words is "six hundred fifty-seven thousand, four hundred forty-eight".