28287324 has 36 divisors (see below), whose sum is σ = 77005656. Its totient is φ = 8703648.

The previous prime is 28287289. The next prime is 28287341. The reversal of 28287324 is 42378282.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29754 + ... + 30689.

It is an arithmetic number, because the mean of its divisors is an integer number (2139046).

Almost surely, 2^28287324 is an apocalyptic number.

It is an amenable number.

28287324 is an abundant number, since it is smaller than the sum of its proper divisors (48718332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28287324 is a wasteful number, since it uses less digits than its factorization.

28287324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60466 (or 60461 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28287324 is about 5318.5828939672. The cubic root of 28287324 is about 304.6940369880.

The spelling of 28287324 in words is "twenty-eight million, two hundred eighty-seven thousand, three hundred twenty-four".