28519861 has 4 divisors (see below), whose sum is σ = 28534924. Its totient is φ = 28504800.

The previous prime is 28519837. The next prime is 28519867. The reversal of 28519861 is 16891582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16402500 + 12117361 = 4050^2 + 3481^2 .

It is a cyclic number.

It is not a de Polignac number, because 28519861 - 2¹⁵ = 28487093 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 (28519867) 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, 4200 + ... + 8641.

It is an arithmetic number, because the mean of its divisors is an integer number (7133731).

Almost surely, 2^28519861 is an apocalyptic number.

It is an amenable number.

28519861 is a deficient number, since it is larger than the sum of its proper divisors (15063).

28519861 is a wasteful number, since it uses less digits than its factorization.

28519861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15062.

The product of its digits is 34560, while the sum is 40.

The square root of 28519861 is about 5340.3989551343. The cubic root of 28519861 is about 305.5266757841.

The spelling of 28519861 in words is "twenty-eight million, five hundred nineteen thousand, eight hundred sixty-one".