28538155 has 8 divisors (see below), whose sum is σ = 36260352. Its totient is φ = 21487488.

The previous prime is 28538141. The next prime is 28538161. The reversal of 28538155 is 55183582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28538155 - 2⁹ = 28537643 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167787 + ... + 167956.

It is an arithmetic number, because the mean of its divisors is an integer number (4532544).

Almost surely, 2^28538155 is an apocalyptic number.

28538155 is a deficient number, since it is larger than the sum of its proper divisors (7722197).

28538155 is a wasteful number, since it uses less digits than its factorization.

28538155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335765.

The product of its digits is 48000, while the sum is 37.

The square root of 28538155 is about 5342.1114739399. Note that the first 3 decimals coincide. The cubic root of 28538155 is about 305.5919882851.

The spelling of 28538155 in words is "twenty-eight million, five hundred thirty-eight thousand, one hundred fifty-five".