28700173 has 4 divisors (see below), whose sum is σ = 28751008. Its totient is φ = 28649340.

The previous prime is 28700171. The next prime is 28700179. The reversal of 28700173 is 37100782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28700173 - 2¹ = 28700171 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28700171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24561 + ... + 25702.

It is an arithmetic number, because the mean of its divisors is an integer number (7187752).

Almost surely, 2^28700173 is an apocalyptic number.

It is an amenable number.

28700173 is a deficient number, since it is larger than the sum of its proper divisors (50835).

28700173 is an equidigital number, since it uses as much as digits as its factorization.

28700173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50834.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 28700173 is about 5357.2542407468. The cubic root of 28700173 is about 306.1692038421.

The spelling of 28700173 in words is "twenty-eight million, seven hundred thousand, one hundred seventy-three".