28213136 has 20 divisors (see below), whose sum is σ = 62472192. Its totient is φ = 12091296.

The previous prime is 28213127. The next prime is 28213189. The reversal of 28213136 is 63131282.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125840 + ... + 126063.

Almost surely, 2^28213136 is an apocalyptic number.

It is an amenable number.

28213136 is an abundant number, since it is smaller than the sum of its proper divisors (34259056).

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

28213136 is a wasteful number, since it uses less digits than its factorization.

28213136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251918 (or 251912 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 28213136 is about 5311.6039008947. The cubic root of 28213136 is about 304.4274342807.

The spelling of 28213136 in words is "twenty-eight million, two hundred thirteen thousand, one hundred thirty-six".