28158155 has 8 divisors (see below), whose sum is σ = 33848592. Its totient is φ = 22487328.

The previous prime is 28158083. The next prime is 28158173. The reversal of 28158155 is 55185182.

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 28158155 - 2¹² = 28154059 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, 1529 + ... + 7658.

It is an arithmetic number, because the mean of its divisors is an integer number (4231074).

Almost surely, 2^28158155 is an apocalyptic number.

28158155 is a deficient number, since it is larger than the sum of its proper divisors (5690437).

28158155 is an equidigital number, since it uses as much as digits as its factorization.

28158155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9805.

The product of its digits is 16000, while the sum is 35.

The square root of 28158155 is about 5306.4258215865. The cubic root of 28158155 is about 304.2295523528.

The spelling of 28158155 in words is "twenty-eight million, one hundred fifty-eight thousand, one hundred fifty-five".