28089554 has 4 divisors (see below), whose sum is σ = 42134334. Its totient is φ = 14044776.

The previous prime is 28089553. The next prime is 28089569. The reversal of 28089554 is 45598082.

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

It can be written as a sum of positive squares in only one way, i.e., 26801329 + 1288225 = 5177^2 + 1135^2 .

It is not an unprimeable number, because it can be changed into a prime (28089553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7022387 + ... + 7022390.

Almost surely, 2^28089554 is an apocalyptic number.

28089554 is a deficient number, since it is larger than the sum of its proper divisors (14044780).

28089554 is a wasteful number, since it uses less digits than its factorization.

28089554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14044779.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 28089554 is about 5299.9579243613. The cubic root of 28089554 is about 303.9822891921.

The spelling of 28089554 in words is "twenty-eight million, eighty-nine thousand, five hundred fifty-four".