28398155 has 8 divisors (see below), whose sum is σ = 34135584. Its totient is φ = 22680000.

The previous prime is 28398131. The next prime is 28398157. The reversal of 28398155 is 55189382.

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

It is not a de Polignac number, because 28398155 - 2⁸ = 28397899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28398157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1346 + ... + 7655.

It is an arithmetic number, because the mean of its divisors is an integer number (4266948).

Almost surely, 2^28398155 is an apocalyptic number.

28398155 is a deficient number, since it is larger than the sum of its proper divisors (5737429).

28398155 is an equidigital number, since it uses as much as digits as its factorization.

28398155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9637.

The product of its digits is 86400, while the sum is 41.

The square root of 28398155 is about 5328.9919309378. The cubic root of 28398155 is about 305.0914533600.

The spelling of 28398155 in words is "twenty-eight million, three hundred ninety-eight thousand, one hundred fifty-five".