252291778 has 16 divisors (see below), whose sum is σ = 390156984. Its totient is φ = 122279040.

The previous prime is 252291773. The next prime is 252291779. The reversal of 252291778 is 877192252.

It can be written as a sum of positive squares in 4 ways, for example, as 112508449 + 139783329 = 10607^2 + 11823^2 .

It is a super-2 number, since 2×252291778² = 127302282492802568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (252291773) 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 7 ways as a sum of consecutive naturals, for example, 3076 + ... + 22672.

Almost surely, 2^252291778 is an apocalyptic number.

252291778 is a deficient number, since it is larger than the sum of its proper divisors (137865206).

252291778 is a wasteful number, since it uses less digits than its factorization.

252291778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19797.

The product of its digits is 141120, while the sum is 43.

The square root of 252291778 is about 15883.6953508936. The cubic root of 252291778 is about 631.8796454710.

The spelling of 252291778 in words is "two hundred fifty-two million, two hundred ninety-one thousand, seven hundred seventy-eight".