28188046 has 4 divisors (see below), whose sum is σ = 42282072. Its totient is φ = 14094022.

The previous prime is 28188037. The next prime is 28188049. The reversal of 28188046 is 64088182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64088182 = 2 ⋅32044091.

It is a junction number, because it is equal to n+sod(n) for n = 28187996 and 28188014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28188049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7047010 + ... + 7047013.

It is an arithmetic number, because the mean of its divisors is an integer number (10570518).

Almost surely, 2^28188046 is an apocalyptic number.

28188046 is a deficient number, since it is larger than the sum of its proper divisors (14094026).

28188046 is a wasteful number, since it uses less digits than its factorization.

28188046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14094025.

The product of its (nonzero) digits is 24576, while the sum is 37.

The square root of 28188046 is about 5309.2415654216. The cubic root of 28188046 is about 304.3371648682.

The spelling of 28188046 in words is "twenty-eight million, one hundred eighty-eight thousand, forty-six".