28357987 has 8 divisors (see below), whose sum is σ = 32597856. Its totient is φ = 24165312.

The previous prime is 28357943. The next prime is 28357997. The reversal of 28357987 is 78975382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28357987 - 2⁷ = 28357859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28357987.

It is not an unprimeable number, because it can be changed into a prime (28357997) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 10498 + ... + 12919.

It is an arithmetic number, because the mean of its divisors is an integer number (4074732).

Almost surely, 2^28357987 is an apocalyptic number.

28357987 is a deficient number, since it is larger than the sum of its proper divisors (4239869).

28357987 is a wasteful number, since it uses less digits than its factorization.

28357987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23597.

The product of its digits is 846720, while the sum is 49.

The square root of 28357987 is about 5325.2217794191. The cubic root of 28357987 is about 304.9475391272.

The spelling of 28357987 in words is "twenty-eight million, three hundred fifty-seven thousand, nine hundred eighty-seven".