28988927 has 32 divisors (see below), whose sum is σ = 36288000. Its totient is φ = 22809600.

The previous prime is 28988903. The next prime is 28988929. The reversal of 28988927 is 72988982.

It is not a de Polignac number, because 28988927 - 2⁶ = 28988863 is a prime.

It is a super-2 number, since 2×28988927² = 1680715777222658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28988929) 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, 145574 + ... + 145772.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^28988927 is an apocalyptic number.

28988927 is a deficient number, since it is larger than the sum of its proper divisors (7299073).

28988927 is a wasteful number, since it uses less digits than its factorization.

28988927 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287.

The product of its digits is 1161216, while the sum is 53.

The square root of 28988927 is about 5384.1366067365. The cubic root of 28988927 is about 307.1925744134.

The spelling of 28988927 in words is "twenty-eight million, nine hundred eighty-eight thousand, nine hundred twenty-seven".