28187339 has 8 divisors (see below), whose sum is σ = 29313408. Its totient is φ = 27074880.

The previous prime is 28187297. The next prime is 28187353. The reversal of 28187339 is 93378182.

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 28187339 - 2¹⁶ = 28121803 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28187296 and 28187305.

It is not an unprimeable number, because it can be changed into a prime (28187359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929 + ... + 7565.

It is an arithmetic number, because the mean of its divisors is an integer number (3664176).

Almost surely, 2^28187339 is an apocalyptic number.

28187339 is a deficient number, since it is larger than the sum of its proper divisors (1126069).

28187339 is a wasteful number, since it uses less digits than its factorization.

28187339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6805.

The product of its digits is 72576, while the sum is 41.

The square root of 28187339 is about 5309.1749829894. The cubic root of 28187339 is about 304.3346204306.

The spelling of 28187339 in words is "twenty-eight million, one hundred eighty-seven thousand, three hundred thirty-nine".