657049647 has 4 divisors (see below), whose sum is σ = 876066200. Its totient is φ = 438033096.

The previous prime is 657049543. The next prime is 657049667. The reversal of 657049647 is 746940756.

657049647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 657049647 - 2⁸ = 657049391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 657049596 and 657049605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657049667) 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, 109508272 + ... + 109508277.

It is an arithmetic number, because the mean of its divisors is an integer number (219016550).

Almost surely, 2^657049647 is an apocalyptic number.

657049647 is a deficient number, since it is larger than the sum of its proper divisors (219016553).

657049647 is a wasteful number, since it uses less digits than its factorization.

657049647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219016552.

The product of its (nonzero) digits is 1270080, while the sum is 48.

The square root of 657049647 is about 25632.9796746301. The cubic root of 657049647 is about 869.3594823079.

The spelling of 657049647 in words is "six hundred fifty-seven million, forty-nine thousand, six hundred forty-seven".