28102345 has 4 divisors (see below), whose sum is σ = 33722820. Its totient is φ = 22481872.

The previous prime is 28102331. The next prime is 28102391. The reversal of 28102345 is 54320182.

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 19245769 + 8856576 = 4387^2 + 2976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28102345 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, 2810230 + ... + 2810239.

It is an arithmetic number, because the mean of its divisors is an integer number (8430705).

Almost surely, 2^28102345 is an apocalyptic number.

It is an amenable number.

28102345 is a deficient number, since it is larger than the sum of its proper divisors (5620475).

28102345 is an equidigital number, since it uses as much as digits as its factorization.

28102345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5620474.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28102345 is about 5301.1644947125. The cubic root of 28102345 is about 304.0284231561.

The spelling of 28102345 in words is "twenty-eight million, one hundred two thousand, three hundred forty-five".