28213251 has 16 divisors (see below), whose sum is σ = 43452288. Its totient is φ = 16092800.

The previous prime is 28213219. The next prime is 28213253. The reversal of 28213251 is 15231282.

It is a cyclic number.

It is not a de Polignac number, because 28213251 - 2⁵ = 28213219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28213253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24585 + ... + 25706.

It is an arithmetic number, because the mean of its divisors is an integer number (2715768).

Almost surely, 2^28213251 is an apocalyptic number.

28213251 is a deficient number, since it is larger than the sum of its proper divisors (15239037).

28213251 is a wasteful number, since it uses less digits than its factorization.

28213251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50322.

The product of its digits is 960, while the sum is 24.

The square root of 28213251 is about 5311.6147262391. The cubic root of 28213251 is about 304.4278479072.

The spelling of 28213251 in words is "twenty-eight million, two hundred thirteen thousand, two hundred fifty-one".