249745664 has 36 divisors (see below), whose sum is σ = 569736384. Its totient is φ = 107033088.

The previous prime is 249745619. The next prime is 249745669. The reversal of 249745664 is 466547942.

It is not an unprimeable number, because it can be changed into a prime (249745669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67892 + ... + 71475.

Almost surely, 2^249745664 is an apocalyptic number.

It is an amenable number.

249745664 is an abundant number, since it is smaller than the sum of its proper divisors (319990720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249745664 is an equidigital number, since it uses as much as digits as its factorization.

249745664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139390 (or 139376 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 47.

The square root of 249745664 is about 15803.3434437147. The cubic root of 249745664 is about 629.7468236084.

The spelling of 249745664 in words is "two hundred forty-nine million, seven hundred forty-five thousand, six hundred sixty-four".