28252291 has 4 divisors (see below), whose sum is σ = 28289800. Its totient is φ = 28214784.

The previous prime is 28252261. The next prime is 28252363. The reversal of 28252291 is 19225282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28252291 - 2⁷ = 28252163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28252261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17601 + ... + 19138.

It is an arithmetic number, because the mean of its divisors is an integer number (7072450).

Almost surely, 2^28252291 is an apocalyptic number.

28252291 is a deficient number, since it is larger than the sum of its proper divisors (37509).

28252291 is an equidigital number, since it uses as much as digits as its factorization.

28252291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37508.

The product of its digits is 5760, while the sum is 31.

The square root of 28252291 is about 5315.2884211489. The cubic root of 28252291 is about 304.5682002250.

The spelling of 28252291 in words is "twenty-eight million, two hundred fifty-two thousand, two hundred ninety-one".