28759387 has 4 divisors (see below), whose sum is σ = 29751120. Its totient is φ = 27767656.

The previous prime is 28759363. The next prime is 28759391. The reversal of 28759387 is 78395782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78395782 = 2 ⋅39197891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28759387 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 28759387.

It is not an unprimeable number, because it can be changed into a prime (28759987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495823 + ... + 495880.

It is an arithmetic number, because the mean of its divisors is an integer number (7437780).

Almost surely, 2^28759387 is an apocalyptic number.

28759387 is a deficient number, since it is larger than the sum of its proper divisors (991733).

28759387 is an equidigital number, since it uses as much as digits as its factorization.

28759387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991732.

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

The square root of 28759387 is about 5362.7779182062. Note that the first 3 decimals coincide. The cubic root of 28759387 is about 306.3796212646.

The spelling of 28759387 in words is "twenty-eight million, seven hundred fifty-nine thousand, three hundred eighty-seven".