253664242 has 16 divisors (see below), whose sum is σ = 433869912. Its totient is φ = 110188800.

The previous prime is 253664239. The next prime is 253664249. The reversal of 253664242 is 242466352.

It can be written as a sum of positive squares in 4 ways, for example, as 131583841 + 122080401 = 11471^2 + 11049^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 253664198 and 253664207.

It is not an unprimeable number, because it can be changed into a prime (253664249) 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, 286509 + ... + 287392.

Almost surely, 2^253664242 is an apocalyptic number.

253664242 is a deficient number, since it is larger than the sum of its proper divisors (180205670).

253664242 is a wasteful number, since it uses less digits than its factorization.

253664242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573933.

The product of its digits is 69120, while the sum is 34.

The square root of 253664242 is about 15926.8403018301. The cubic root of 253664242 is about 633.0233796968.

The spelling of 253664242 in words is "two hundred fifty-three million, six hundred sixty-four thousand, two hundred forty-two".