28493291 has 4 divisors (see below), whose sum is σ = 28918632. Its totient is φ = 28067952.

The previous prime is 28493281. The next prime is 28493299. The reversal of 28493291 is 19239482.

28493291 = 393² + 394² + ... + 526².

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 28493291 - 2¹⁴ = 28476907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28493299) 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, 212570 + ... + 212703.

It is an arithmetic number, because the mean of its divisors is an integer number (7229658).

Almost surely, 2^28493291 is an apocalyptic number.

28493291 is a deficient number, since it is larger than the sum of its proper divisors (425341).

28493291 is an equidigital number, since it uses as much as digits as its factorization.

28493291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425340.

The product of its digits is 31104, while the sum is 38.

The square root of 28493291 is about 5337.9107336110. The cubic root of 28493291 is about 305.4317668827.

The spelling of 28493291 in words is "twenty-eight million, four hundred ninety-three thousand, two hundred ninety-one".