252691728 has 40 divisors (see below), whose sum is σ = 656812128. Its totient is φ = 83711232.

The previous prime is 252691727. The next prime is 252691729. The reversal of 252691728 is 827196252.

It is an interprime number because it is at equal distance from previous prime (252691727) and next prime (252691729).

It is a self number, because there is not a number n which added to its sum of digits gives 252691728.

It is not an unprimeable number, because it can be changed into a prime (252691721) 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, 8325 + ... + 23972.

Almost surely, 2^252691728 is an apocalyptic number.

It is an amenable number.

252691728 is an abundant number, since it is smaller than the sum of its proper divisors (404120400).

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

252691728 is a wasteful number, since it uses less digits than its factorization.

252691728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32471 (or 32465 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 252691728 is about 15896.2803196219. The cubic root of 252691728 is about 632.2133686447.

The spelling of 252691728 in words is "two hundred fifty-two million, six hundred ninety-one thousand, seven hundred twenty-eight".