28341891 has 12 divisors (see below), whose sum is σ = 40985568. Its totient is φ = 18872784.

The previous prime is 28341883. The next prime is 28341899. The reversal of 28341891 is 19814382.

It is an interprime number because it is at equal distance from previous prime (28341883) and next prime (28341899).

It is not a de Polignac number, because 28341891 - 2³ = 28341883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28341899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11701 + ... + 13913.

It is an arithmetic number, because the mean of its divisors is an integer number (3415464).

Almost surely, 2^28341891 is an apocalyptic number.

28341891 is the 2846-th nonagonal number.

28341891 is a deficient number, since it is larger than the sum of its proper divisors (12643677).

28341891 is a wasteful number, since it uses less digits than its factorization.

28341891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3642 (or 3639 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 28341891 is about 5323.7102663462. The cubic root of 28341891 is about 304.8898321097.

The spelling of 28341891 in words is "twenty-eight million, three hundred forty-one thousand, eight hundred ninety-one".