28436889 has 32 divisors (see below), whose sum is σ = 43208704. Its totient is φ = 16511040.

The previous prime is 28436887. The next prime is 28436897. The reversal of 28436889 is 98863482.

It is a happy number.

It is not a de Polignac number, because 28436889 - 2¹ = 28436887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28436887) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51714 + ... + 52260.

It is an arithmetic number, because the mean of its divisors is an integer number (1350272).

Almost surely, 2^28436889 is an apocalyptic number.

It is an amenable number.

28436889 is a deficient number, since it is larger than the sum of its proper divisors (14771815).

28436889 is a wasteful number, since it uses less digits than its factorization.

28436889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637.

The product of its digits is 663552, while the sum is 48.

The square root of 28436889 is about 5332.6249633740. The cubic root of 28436889 is about 305.2301013765.

It can be divided in two parts, 284 and 36889, that added together give a palindrome (37173).

The spelling of 28436889 in words is "twenty-eight million, four hundred thirty-six thousand, eight hundred eighty-nine".