28359891 has 24 divisors (see below), whose sum is σ = 47290464. Its totient is φ = 16041600.

The previous prime is 28359889. The next prime is 28359907. The reversal of 28359891 is 19895382.

It is a happy number.

It is not a de Polignac number, because 28359891 - 2¹ = 28359889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28359811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4135 + ... + 8591.

It is an arithmetic number, because the mean of its divisors is an integer number (1970436).

Almost surely, 2^28359891 is an apocalyptic number.

28359891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28359891 is a deficient number, since it is larger than the sum of its proper divisors (18930573).

28359891 is a wasteful number, since it uses less digits than its factorization.

28359891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571 (or 4568 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 28359891 is about 5325.4005483156. The cubic root of 28359891 is about 304.9543638608.

The spelling of 28359891 in words is "twenty-eight million, three hundred fifty-nine thousand, eight hundred ninety-one".