252728394 has 8 divisors (see below), whose sum is σ = 505456800. Its totient is φ = 84242796.

The previous prime is 252728383. The next prime is 252728419. The reversal of 252728394 is 493827252.

It is a sphenic number, since it is the product of 3 distinct primes.

252728394 is an admirable number.

It is a super-2 number, since 2×252728394² = 127743282267638472, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21060694 + ... + 21060705.

It is an arithmetic number, because the mean of its divisors is an integer number (63182100).

Almost surely, 2^252728394 is an apocalyptic number.

252728394 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

252728394 is a wasteful number, since it uses less digits than its factorization.

252728394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42121404.

The product of its digits is 241920, while the sum is 42.

The square root of 252728394 is about 15897.4335664597. The cubic root of 252728394 is about 632.2439455779.

The spelling of 252728394 in words is "two hundred fifty-two million, seven hundred twenty-eight thousand, three hundred ninety-four".