28915859 has 4 divisors (see below), whose sum is σ = 33046704. Its totient is φ = 24785016.

The previous prime is 28915849. The next prime is 28915867. The reversal of 28915859 is 95851982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95851982 = 2 ⋅47925991.

It is a cyclic number.

It is not a de Polignac number, because 28915859 - 2¹⁶ = 28850323 is a prime.

It is a super-2 number, since 2×28915859² = 1672253803415762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28915819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065412 + ... + 2065425.

It is an arithmetic number, because the mean of its divisors is an integer number (8261676).

Almost surely, 2^28915859 is an apocalyptic number.

28915859 is a deficient number, since it is larger than the sum of its proper divisors (4130845).

28915859 is an equidigital number, since it uses as much as digits as its factorization.

28915859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4130844.

The product of its digits is 259200, while the sum is 47.

The square root of 28915859 is about 5377.3468364985. The cubic root of 28915859 is about 306.9342593197.

The spelling of 28915859 in words is "twenty-eight million, nine hundred fifteen thousand, eight hundred fifty-nine".