28895551 has 4 divisors (see below), whose sum is σ = 28976400. Its totient is φ = 28814704.

The previous prime is 28895549. The next prime is 28895579. The reversal of 28895551 is 15559882.

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 28895551 - 2¹ = 28895549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28895498 and 28895507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28895051) 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, 39886 + ... + 40603.

It is an arithmetic number, because the mean of its divisors is an integer number (7244100).

Almost surely, 2^28895551 is an apocalyptic number.

28895551 is a deficient number, since it is larger than the sum of its proper divisors (80849).

28895551 is an equidigital number, since it uses as much as digits as its factorization.

28895551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80848.

The product of its digits is 144000, while the sum is 43.

The square root of 28895551 is about 5375.4582130271. The cubic root of 28895551 is about 306.8623877937.

The spelling of 28895551 in words is "twenty-eight million, eight hundred ninety-five thousand, five hundred fifty-one".