28987329 has 16 divisors (see below), whose sum is σ = 46770048. Its totient is φ = 15589632.

The previous prime is 28987313. The next prime is 28987367. The reversal of 28987329 is 92378982.

It is a happy number.

It is not a de Polignac number, because 28987329 - 2⁴ = 28987313 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28987129) 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, 40242 + ... + 40955.

It is an arithmetic number, because the mean of its divisors is an integer number (2923128).

Almost surely, 2^28987329 is an apocalyptic number.

It is an amenable number.

28987329 is a deficient number, since it is larger than the sum of its proper divisors (17782719).

28987329 is a wasteful number, since it uses less digits than its factorization.

28987329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81224.

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

The square root of 28987329 is about 5383.9882057820. The cubic root of 28987329 is about 307.1869296977.

The spelling of 28987329 in words is "twenty-eight million, nine hundred eighty-seven thousand, three hundred twenty-nine".