28839387 has 4 divisors (see below), whose sum is σ = 38452520. Its totient is φ = 19226256.

The previous prime is 28839383. The next prime is 28839407. The reversal of 28839387 is 78393882.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28839387 - 2² = 28839383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28839383) 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, 4806562 + ... + 4806567.

It is an arithmetic number, because the mean of its divisors is an integer number (9613130).

Almost surely, 2^28839387 is an apocalyptic number.

28839387 is a deficient number, since it is larger than the sum of its proper divisors (9613133).

28839387 is an equidigital number, since it uses as much as digits as its factorization.

28839387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9613132.

The product of its digits is 580608, while the sum is 48.

The square root of 28839387 is about 5370.2315592533. The cubic root of 28839387 is about 306.6634437017.

The spelling of 28839387 in words is "twenty-eight million, eight hundred thirty-nine thousand, three hundred eighty-seven".