657479 has 8 divisors (see below), whose sum is σ = 688128. Its totient is φ = 627480.

The previous prime is 657473. The next prime is 657491. The reversal of 657479 is 974756.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-657479 is a prime.

It is a super-3 number, since 3×657479³ = 852642374853339717, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3854 + ... + 4020.

It is an arithmetic number, because the mean of its divisors is an integer number (86016).

2⁶⁵⁷⁴⁷⁹ is an apocalyptic number.

657479 is a deficient number, since it is larger than the sum of its proper divisors (30649).

657479 is a wasteful number, since it uses less digits than its factorization.

657479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its digits is 52920, while the sum is 38.

The square root of 657479 is about 810.8507877532. The cubic root of 657479 is about 86.9548803784.

It can be divided in two parts, 65747 and 9, that added together give a palindrome (65756).

The spelling of 657479 in words is "six hundred fifty-seven thousand, four hundred seventy-nine".