28620559 has 4 divisors (see below), whose sum is σ = 31222440. Its totient is φ = 26018680.

The previous prime is 28620551. The next prime is 28620563. The reversal of 28620559 is 95502682.

It is a happy number.

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 28620559 - 2³ = 28620551 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 (28620551) 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, 1300924 + ... + 1300945.

It is an arithmetic number, because the mean of its divisors is an integer number (7805610).

Almost surely, 2^28620559 is an apocalyptic number.

28620559 is a deficient number, since it is larger than the sum of its proper divisors (2601881).

28620559 is a wasteful number, since it uses less digits than its factorization.

28620559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601880.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 28620559 is about 5349.8185950554. The cubic root of 28620559 is about 305.8858382007.

The spelling of 28620559 in words is "twenty-eight million, six hundred twenty thousand, five hundred fifty-nine".