28387235 has 12 divisors (see below), whose sum is σ = 35954208. Its totient is φ = 21513168.

The previous prime is 28387213. The next prime is 28387243. The reversal of 28387235 is 53278382.

It is not a de Polignac number, because 28387235 - 2²⁴ = 11610019 is a prime.

It is a super-2 number, since 2×28387235² = 1611670221890450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6059 + ... + 9668.

It is an arithmetic number, because the mean of its divisors is an integer number (2996184).

Almost surely, 2^28387235 is an apocalyptic number.

28387235 is a deficient number, since it is larger than the sum of its proper divisors (7566973).

28387235 is a wasteful number, since it uses less digits than its factorization.

28387235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15770 (or 15751 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 28387235 is about 5327.9672483978. The cubic root of 28387235 is about 305.0523425351.

The spelling of 28387235 in words is "twenty-eight million, three hundred eighty-seven thousand, two hundred thirty-five".