28317145 has 4 divisors (see below), whose sum is σ = 33980580. Its totient is φ = 22653712.

The previous prime is 28317127. The next prime is 28317151. The reversal of 28317145 is 54171382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11309769 + 17007376 = 3363^2 + 4124^2 .

It is a cyclic number.

It is not a de Polignac number, because 28317145 - 2⁷ = 28317017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2831710 + ... + 2831719.

It is an arithmetic number, because the mean of its divisors is an integer number (8495145).

Almost surely, 2^28317145 is an apocalyptic number.

It is an amenable number.

28317145 is a deficient number, since it is larger than the sum of its proper divisors (5663435).

28317145 is an equidigital number, since it uses as much as digits as its factorization.

28317145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5663434.

The product of its digits is 6720, while the sum is 31.

The square root of 28317145 is about 5321.3856278229. The cubic root of 28317145 is about 304.8010706752.

The spelling of 28317145 in words is "twenty-eight million, three hundred seventeen thousand, one hundred forty-five".