28536291 has 12 divisors (see below), whose sum is σ = 47107632. Its totient is φ = 16306416.

The previous prime is 28536281. The next prime is 28536293. The reversal of 28536291 is 19263582.

28536291 is a `hidden beast` number, since 28 + 5 + 3 + 629 + 1 = 666.

It is not a de Polignac number, because 28536291 - 2¹⁰ = 28535267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28536293) 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, 226416 + ... + 226541.

It is an arithmetic number, because the mean of its divisors is an integer number (3925636).

Almost surely, 2^28536291 is an apocalyptic number.

28536291 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28536291 is a deficient number, since it is larger than the sum of its proper divisors (18571341).

28536291 is a wasteful number, since it uses less digits than its factorization.

28536291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452970 (or 452967 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28536291 is about 5341.9370082396. The cubic root of 28536291 is about 305.5853347848.

The spelling of 28536291 in words is "twenty-eight million, five hundred thirty-six thousand, two hundred ninety-one".