657057823 has 8 divisors (see below), whose sum is σ = 669447216. Its totient is φ = 644784000.

The previous prime is 657057787. The next prime is 657057827. The reversal of 657057823 is 328750756.

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

It is not a de Polignac number, because 657057823 - 2⁹ = 657057311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 657057823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657057827) 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, 17373 + ... + 40198.

It is an arithmetic number, because the mean of its divisors is an integer number (83680902).

Almost surely, 2^657057823 is an apocalyptic number.

657057823 is a deficient number, since it is larger than the sum of its proper divisors (12389393).

657057823 is a wasteful number, since it uses less digits than its factorization.

657057823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57785.

The product of its (nonzero) digits is 352800, while the sum is 43.

The square root of 657057823 is about 25633.1391561783. The cubic root of 657057823 is about 869.3630882524.

The spelling of 657057823 in words is "six hundred fifty-seven million, fifty-seven thousand, eight hundred twenty-three".