28923987 has 24 divisors (see below), whose sum is σ = 41619376. Its totient is φ = 17860608.

The previous prime is 28923971. The next prime is 28923997. The reversal of 28923987 is 78932982.

It is a happy number.

It is not a de Polignac number, because 28923987 - 2⁴ = 28923971 is a prime.

It is a Duffinian number.

Its product of digits (435456) is a multiple of the sum of its prime factors (567).

It is not an unprimeable number, because it can be changed into a prime (28923997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63063 + ... + 63519.

Almost surely, 2^28923987 is an apocalyptic number.

28923987 is a deficient number, since it is larger than the sum of its proper divisors (12695389).

28923987 is a wasteful number, since it uses less digits than its factorization.

28923987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567 (or 550 counting only the distinct ones).

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

The square root of 28923987 is about 5378.1025464377. The cubic root of 28923987 is about 306.9630154883.

The spelling of 28923987 in words is "twenty-eight million, nine hundred twenty-three thousand, nine hundred eighty-seven".