252209128 has 8 divisors (see below), whose sum is σ = 472892130. Its totient is φ = 126104560.

The previous prime is 252209117. The next prime is 252209227. The reversal of 252209128 is 821902252.

252209128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 172607044 + 79602084 = 13138^2 + 8922^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 252209128.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15763063 + ... + 15763078.

Almost surely, 2^252209128 is an apocalyptic number.

It is an amenable number.

252209128 is a deficient number, since it is larger than the sum of its proper divisors (220683002).

252209128 is a wasteful number, since it uses less digits than its factorization.

252209128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31526147 (or 31526143 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 252209128 is about 15881.0934132383. The cubic root of 252209128 is about 631.8106373341.

The spelling of 252209128 in words is "two hundred fifty-two million, two hundred nine thousand, one hundred twenty-eight".