251622228 has 96 divisors (see below), whose sum is σ = 693407232. Its totient is φ = 70012800.

The previous prime is 251622211. The next prime is 251622271. The reversal of 251622228 is 822226152.

It is a junction number, because it is equal to n+sod(n) for n = 251622195 and 251622204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 567775 + ... + 568217.

It is an arithmetic number, because the mean of its divisors is an integer number (7222992).

Almost surely, 2^251622228 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 251622228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346703616).

251622228 is an abundant number, since it is smaller than the sum of its proper divisors (441785004).

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

251622228 is a wasteful number, since it uses less digits than its factorization.

251622228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 803 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 251622228 is about 15862.6047041462. The cubic root of 251622228 is about 631.3201744291.

The spelling of 251622228 in words is "two hundred fifty-one million, six hundred twenty-two thousand, two hundred twenty-eight".