28730155 has 8 divisors (see below), whose sum is σ = 35665200. Its totient is φ = 22191456.

The previous prime is 28730131. The next prime is 28730161. The reversal of 28730155 is 55103782.

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 28730155 - 2⁵ = 28730123 is a prime.

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, 98925 + ... + 99214.

It is an arithmetic number, because the mean of its divisors is an integer number (4458150).

Almost surely, 2^28730155 is an apocalyptic number.

28730155 is a deficient number, since it is larger than the sum of its proper divisors (6935045).

28730155 is a wasteful number, since it uses less digits than its factorization.

28730155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198173.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 28730155 is about 5360.0517721380. The cubic root of 28730155 is about 306.2757812532.

The spelling of 28730155 in words is "twenty-eight million, seven hundred thirty thousand, one hundred fifty-five".