657448249 has 8 divisors (see below), whose sum is σ = 664749288. Its totient is φ = 650158080.

The previous prime is 657448247. The next prime is 657448271. The reversal of 657448249 is 942844756.

It can be written as a sum of positive squares in 4 ways, for example, as 153760000 + 503688249 = 12400^2 + 22443^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 657448249 - 2¹ = 657448247 is a prime.

It is a super-2 number, since 2×657448249² = 864476400226332002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657448247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200229 + ... + 203485.

It is an arithmetic number, because the mean of its divisors is an integer number (83093661).

Almost surely, 2^657448249 is an apocalyptic number.

It is an amenable number.

657448249 is a deficient number, since it is larger than the sum of its proper divisors (7301039).

657448249 is a wasteful number, since it uses less digits than its factorization.

657448249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5435.

The product of its digits is 1935360, while the sum is 49.

The square root of 657448249 is about 25640.7536745705. The cubic root of 657448249 is about 869.5352469954.

The spelling of 657448249 in words is "six hundred fifty-seven million, four hundred forty-eight thousand, two hundred forty-nine".