657217042 has 32 divisors (see below), whose sum is σ = 1094176512. Its totient is φ = 294480384.

The previous prime is 657217021. The next prime is 657217091. The reversal of 657217042 is 240712756.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 657216989 and 657217007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 180403 + ... + 184009.

It is an arithmetic number, because the mean of its divisors is an integer number (34193016).

Almost surely, 2^657217042 is an apocalyptic number.

657217042 is a deficient number, since it is larger than the sum of its proper divisors (436959470).

657217042 is a wasteful number, since it uses less digits than its factorization.

657217042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3882.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 657217042 is about 25636.2446937924. The cubic root of 657217042 is about 869.4333042656.

Adding to 657217042 its reverse (240712756), we get a palindrome (897929798).

The spelling of 657217042 in words is "six hundred fifty-seven million, two hundred seventeen thousand, forty-two".