28151226 has 20 divisors (see below), whose sum is σ = 63079962. Its totient is φ = 9383688.

The previous prime is 28151213. The next prime is 28151251. The reversal of 28151226 is 62215182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28100601 + 50625 = 5301^2 + 225^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 28151226.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 86725 + ... + 87048.

Almost surely, 2^28151226 is an apocalyptic number.

28151226 is an abundant number, since it is smaller than the sum of its proper divisors (34928736).

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

28151226 is a wasteful number, since it uses less digits than its factorization.

28151226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173787 (or 173778 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 28151226 is about 5305.7728937451. The cubic root of 28151226 is about 304.2045959414.

The spelling of 28151226 in words is "twenty-eight million, one hundred fifty-one thousand, two hundred twenty-six".