28521214 has 4 divisors (see below), whose sum is σ = 42781824. Its totient is φ = 14260606.

The previous prime is 28521203. The next prime is 28521217. The reversal of 28521214 is 41212582.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28521217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7130302 + ... + 7130305.

It is an arithmetic number, because the mean of its divisors is an integer number (10695456).

Almost surely, 2^28521214 is an apocalyptic number.

28521214 is a deficient number, since it is larger than the sum of its proper divisors (14260610).

28521214 is a wasteful number, since it uses less digits than its factorization.

28521214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14260609.

The product of its digits is 1280, while the sum is 25.

The square root of 28521214 is about 5340.5256295612. The cubic root of 28521214 is about 305.5315071664.

Adding to 28521214 its reverse (41212582), we get a palindrome (69733796).

The spelling of 28521214 in words is "twenty-eight million, five hundred twenty-one thousand, two hundred fourteen".