249989768 has 24 divisors (see below), whose sum is σ = 545259150. Its totient is φ = 107138304.

The previous prime is 249989767. The next prime is 249989819. The reversal of 249989768 is 867989942.

It can be written as a sum of positive squares in only one way, i.e., 248945284 + 1044484 = 15778^2 + 1022^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 249989768.

It is not an unprimeable number, because it can be changed into a prime (249989767) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 318473 + ... + 319256.

Almost surely, 2^249989768 is an apocalyptic number.

249989768 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

249989768 is an abundant number, since it is smaller than the sum of its proper divisors (295269382).

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

249989768 is a wasteful number, since it uses less digits than its factorization.

249989768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637749 (or 637738 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 62.

The square root of 249989768 is about 15811.0647332809. The cubic root of 249989768 is about 629.9519304887.

The spelling of 249989768 in words is "two hundred forty-nine million, nine hundred eighty-nine thousand, seven hundred sixty-eight".