28163386 has 4 divisors (see below), whose sum is σ = 42245082. Its totient is φ = 14081692.

The previous prime is 28163353. The next prime is 28163411. The reversal of 28163386 is 68336182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68336182 = 2 ⋅34168091.

It can be written as a sum of positive squares in only one way, i.e., 26884225 + 1279161 = 5185^2 + 1131^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7040845 + ... + 7040848.

Almost surely, 2^28163386 is an apocalyptic number.

28163386 is a deficient number, since it is larger than the sum of its proper divisors (14081696).

28163386 is a wasteful number, since it uses less digits than its factorization.

28163386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14081695.

The product of its digits is 41472, while the sum is 37.

The square root of 28163386 is about 5306.9186916703. The cubic root of 28163386 is about 304.2483903088.

The spelling of 28163386 in words is "twenty-eight million, one hundred sixty-three thousand, three hundred eighty-six".