28361389 has 8 divisors (see below), whose sum is σ = 34319808. Its totient is φ = 22879680.

The previous prime is 28361387. The next prime is 28361453. The reversal of 28361389 is 98316382.

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 28361389 - 2¹ = 28361387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28361387) 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, 119047 + ... + 119284.

It is an arithmetic number, because the mean of its divisors is an integer number (4289976).

Almost surely, 2^28361389 is an apocalyptic number.

It is an amenable number.

28361389 is a deficient number, since it is larger than the sum of its proper divisors (5958419).

28361389 is a wasteful number, since it uses less digits than its factorization.

28361389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238355.

The product of its digits is 62208, while the sum is 40.

The square root of 28361389 is about 5325.5411931559. The cubic root of 28361389 is about 304.9597331057.

It can be divided in two parts, 2836 and 1389, that added together give a square (4225 = 65²).

The spelling of 28361389 in words is "twenty-eight million, three hundred sixty-one thousand, three hundred eighty-nine".