28828551 has 4 divisors (see below), whose sum is σ = 38438072. Its totient is φ = 19219032.

The previous prime is 28828537. The next prime is 28828561. The reversal of 28828551 is 15582882.

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

It is not a de Polignac number, because 28828551 - 2⁵ = 28828519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28828511) 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, 4804756 + ... + 4804761.

It is an arithmetic number, because the mean of its divisors is an integer number (9609518).

Almost surely, 2^28828551 is an apocalyptic number.

28828551 is a deficient number, since it is larger than the sum of its proper divisors (9609521).

28828551 is an equidigital number, since it uses as much as digits as its factorization.

28828551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9609520.

The product of its digits is 51200, while the sum is 39.

The square root of 28828551 is about 5369.2225694229. Note that the first 3 decimals coincide. The cubic root of 28828551 is about 306.6250307105.

The spelling of 28828551 in words is "twenty-eight million, eight hundred twenty-eight thousand, five hundred fifty-one".