28689051 has 4 divisors (see below), whose sum is σ = 38252072. Its totient is φ = 19126032.

The previous prime is 28688987. The next prime is 28689071. The reversal of 28689051 is 15098682.

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

It is not a de Polignac number, because 28689051 - 2⁶ = 28688987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28689071) 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, 4781506 + ... + 4781511.

It is an arithmetic number, because the mean of its divisors is an integer number (9563018).

Almost surely, 2^28689051 is an apocalyptic number.

28689051 is a deficient number, since it is larger than the sum of its proper divisors (9563021).

28689051 is an equidigital number, since it uses as much as digits as its factorization.

28689051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9563020.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28689051 is about 5356.2161084109. The cubic root of 28689051 is about 306.1296494481.

The spelling of 28689051 in words is "twenty-eight million, six hundred eighty-nine thousand, fifty-one".