657630445 has 4 divisors (see below), whose sum is σ = 789156540. Its totient is φ = 526104352.

The previous prime is 657630443. The next prime is 657630473. The reversal of 657630445 is 544036756.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 397324489 + 260305956 = 19933^2 + 16134^2 .

It is a cyclic number.

It is not a de Polignac number, because 657630445 - 2¹ = 657630443 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 657630398 and 657630407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657630443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65763040 + ... + 65763049.

It is an arithmetic number, because the mean of its divisors is an integer number (197289135).

Almost surely, 2^657630445 is an apocalyptic number.

It is an amenable number.

657630445 is a deficient number, since it is larger than the sum of its proper divisors (131526095).

657630445 is a wasteful number, since it uses less digits than its factorization.

657630445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131526094.

The product of its (nonzero) digits is 302400, while the sum is 40.

The square root of 657630445 is about 25644.3062881412. The cubic root of 657630445 is about 869.6155631834.

The spelling of 657630445 in words is "six hundred fifty-seven million, six hundred thirty thousand, four hundred forty-five".