251028 has 36 divisors (see below), whose sum is σ = 669760. Its totient is φ = 79056.

The previous prime is 251003. The next prime is 251033. The reversal of 251028 is 820152.

251028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 251028.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 251028.

It is an unprimeable number.

251028 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 501 + ... + 867.

2²⁵¹⁰²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 251028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (334880).

251028 is an abundant number, since it is smaller than the sum of its proper divisors (418732).

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

251028 is a wasteful number, since it uses less digits than its factorization.

251028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 251028 is about 501.0269453832. The cubic root of 251028 is about 63.0822810013.

The spelling of 251028 in words is "two hundred fifty-one thousand, twenty-eight".