28937289 has 16 divisors (see below), whose sum is σ = 41121792. Its totient is φ = 18058128.

The previous prime is 28937287. The next prime is 28937297. The reversal of 28937289 is 98273982.

It is a happy number.

It is not a de Polignac number, because 28937289 - 2¹ = 28937287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28937287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1219 + ... + 7704.

It is an arithmetic number, because the mean of its divisors is an integer number (2570112).

Almost surely, 2^28937289 is an apocalyptic number.

It is an amenable number.

28937289 is a deficient number, since it is larger than the sum of its proper divisors (12184503).

28937289 is a wasteful number, since it uses less digits than its factorization.

28937289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8996.

The product of its digits is 435456, while the sum is 48.

The square root of 28937289 is about 5379.3390857986. The cubic root of 28937289 is about 307.0100652056.

The spelling of 28937289 in words is "twenty-eight million, nine hundred thirty-seven thousand, two hundred eighty-nine".