28291033 has 4 divisors (see below), whose sum is σ = 28949008. Its totient is φ = 27633060.

The previous prime is 28291013. The next prime is 28291063. The reversal of 28291033 is 33019282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33019282 = 2 ⋅16509641.

It is a cyclic number.

It is not a de Polignac number, because 28291033 - 2¹³ = 28282841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28290992 and 28291010.

It is not an unprimeable number, because it can be changed into a prime (28291013) 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, 328923 + ... + 329008.

It is an arithmetic number, because the mean of its divisors is an integer number (7237252).

Almost surely, 2^28291033 is an apocalyptic number.

It is an amenable number.

28291033 is a deficient number, since it is larger than the sum of its proper divisors (657975).

28291033 is an equidigital number, since it uses as much as digits as its factorization.

28291033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657974.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 28291033 is about 5318.9315656436. The cubic root of 28291033 is about 304.7073534449.

The spelling of 28291033 in words is "twenty-eight million, two hundred ninety-one thousand, thirty-three".