28979555 has 16 divisors (see below), whose sum is σ = 39247200. Its totient is φ = 20348160.

The previous prime is 28979551. The next prime is 28979567. The reversal of 28979555 is 55597982.

It is not a de Polignac number, because 28979555 - 2² = 28979551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28979551) 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 in 15 ways as a sum of consecutive naturals, for example, 7490 + ... + 10679.

It is an arithmetic number, because the mean of its divisors is an integer number (2452950).

Almost surely, 2^28979555 is an apocalyptic number.

28979555 is a deficient number, since it is larger than the sum of its proper divisors (10267645).

28979555 is a wasteful number, since it uses less digits than its factorization.

28979555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18214.

The product of its digits is 1134000, while the sum is 50.

The square root of 28979555 is about 5383.2662018518. The cubic root of 28979555 is about 307.1594661497.

The spelling of 28979555 in words is "twenty-eight million, nine hundred seventy-nine thousand, five hundred fifty-five".