28311155 has 8 divisors (see below), whose sum is σ = 34696512. Its totient is φ = 22166848.

The previous prime is 28311149. The next prime is 28311181. The reversal of 28311155 is 55111382.

It is a happy number.

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 28311155 - 2¹⁸ = 28049011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60002 + ... + 60471.

It is an arithmetic number, because the mean of its divisors is an integer number (4337064).

Almost surely, 2^28311155 is an apocalyptic number.

28311155 is a deficient number, since it is larger than the sum of its proper divisors (6385357).

28311155 is a wasteful number, since it uses less digits than its factorization.

28311155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120525.

The product of its digits is 1200, while the sum is 26.

The square root of 28311155 is about 5320.8227747220. The cubic root of 28311155 is about 304.7795773695.

The spelling of 28311155 in words is "twenty-eight million, three hundred eleven thousand, one hundred fifty-five".