249563668 has 24 divisors (see below), whose sum is σ = 450915752. Its totient is φ = 120766464.

The previous prime is 249563663. The next prime is 249563669. The reversal of 249563668 is 866365942.

It can be written as a sum of positive squares in 4 ways, for example, as 42146064 + 207417604 = 6492^2 + 14402^2 .

It is a super-2 number, since 2×249563668² = 124564048771228448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249563663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24196 + ... + 32932.

Almost surely, 2^249563668 is an apocalyptic number.

It is an amenable number.

249563668 is a deficient number, since it is larger than the sum of its proper divisors (201352084).

249563668 is a wasteful number, since it uses less digits than its factorization.

249563668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8971 (or 8969 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 49.

The square root of 249563668 is about 15797.5842457004. The cubic root of 249563668 is about 629.5938156076.

The spelling of 249563668 in words is "two hundred forty-nine million, five hundred sixty-three thousand, six hundred sixty-eight".