28170398 has 4 divisors (see below), whose sum is σ = 42255600. Its totient is φ = 14085198.

The previous prime is 28170367. The next prime is 28170419. The reversal of 28170398 is 89307182.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7042598 + ... + 7042601.

It is an arithmetic number, because the mean of its divisors is an integer number (10563900).

Almost surely, 2^28170398 is an apocalyptic number.

28170398 is a deficient number, since it is larger than the sum of its proper divisors (14085202).

28170398 is a wasteful number, since it uses less digits than its factorization.

28170398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14085201.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28170398 is about 5307.5792975706. The cubic root of 28170398 is about 304.2736383700.

The spelling of 28170398 in words is "twenty-eight million, one hundred seventy thousand, three hundred ninety-eight".