28236386 has 8 divisors (see below), whose sum is σ = 43153884. Its totient is φ = 13851760.

The previous prime is 28236379. The next prime is 28236389. The reversal of 28236386 is 68363282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 23088025 + 5148361 = 4805^2 + 2269^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28236389) 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, 133085 + ... + 133296.

Almost surely, 2^28236386 is an apocalyptic number.

28236386 is a deficient number, since it is larger than the sum of its proper divisors (14917498).

28236386 is a wasteful number, since it uses less digits than its factorization.

28236386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266436.

The product of its digits is 82944, while the sum is 38.

The square root of 28236386 is about 5313.7920546442. The cubic root of 28236386 is about 304.5110359342.

The spelling of 28236386 in words is "twenty-eight million, two hundred thirty-six thousand, three hundred eighty-six".