28144386 has 12 divisors (see below), whose sum is σ = 60979542. Its totient is φ = 9381456.

The previous prime is 28144331. The next prime is 28144393. The reversal of 28144386 is 68344182.

It can be written as a sum of positive squares in only one way, i.e., 24651225 + 3493161 = 4965^2 + 1869^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28144386.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 781771 + ... + 781806.

Almost surely, 2^28144386 is an apocalyptic number.

28144386 is an abundant number, since it is smaller than the sum of its proper divisors (32835156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28144386 is a wasteful number, since it uses less digits than its factorization.

28144386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563585 (or 1563582 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 28144386 is about 5305.1282736613. The cubic root of 28144386 is about 304.1799560675.

The spelling of 28144386 in words is "twenty-eight million, one hundred forty-four thousand, three hundred eighty-six".