28988187 has 4 divisors (see below), whose sum is σ = 38650920. Its totient is φ = 19325456.

The previous prime is 28988171. The next prime is 28988207. The reversal of 28988187 is 78188982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28988187 - 2⁴ = 28988171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28988117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4831362 + ... + 4831367.

It is an arithmetic number, because the mean of its divisors is an integer number (9662730).

Almost surely, 2^28988187 is an apocalyptic number.

28988187 is a deficient number, since it is larger than the sum of its proper divisors (9662733).

28988187 is an equidigital number, since it uses as much as digits as its factorization.

28988187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9662732.

The product of its digits is 516096, while the sum is 51.

The square root of 28988187 is about 5384.0678859019. The cubic root of 28988187 is about 307.1899604907.

The spelling of 28988187 in words is "twenty-eight million, nine hundred eighty-eight thousand, one hundred eighty-seven".