28489655 has 4 divisors (see below), whose sum is σ = 34187592. Its totient is φ = 22791720.

The previous prime is 28489649. The next prime is 28489723. The reversal of 28489655 is 55698482.

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

It is not a de Polignac number, because 28489655 - 2⁴ = 28489639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2848961 + ... + 2848970.

It is an arithmetic number, because the mean of its divisors is an integer number (8546898).

Almost surely, 2^28489655 is an apocalyptic number.

28489655 is a deficient number, since it is larger than the sum of its proper divisors (5697937).

28489655 is an equidigital number, since it uses as much as digits as its factorization.

28489655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5697936.

The product of its digits is 691200, while the sum is 47.

The square root of 28489655 is about 5337.5701400544. The cubic root of 28489655 is about 305.4187743839.

The spelling of 28489655 in words is "twenty-eight million, four hundred eighty-nine thousand, six hundred fifty-five".