28173967 has 4 divisors (see below), whose sum is σ = 28192536. Its totient is φ = 28155400.

The previous prime is 28173949. The next prime is 28173991. The reversal of 28173967 is 76937182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28173967 - 2¹⁵ = 28141199 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 (28173907) 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, 6784 + ... + 10117.

It is an arithmetic number, because the mean of its divisors is an integer number (7048134).

Almost surely, 2^28173967 is an apocalyptic number.

28173967 is a deficient number, since it is larger than the sum of its proper divisors (18569).

28173967 is a wasteful number, since it uses less digits than its factorization.

28173967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18568.

The product of its digits is 127008, while the sum is 43.

The square root of 28173967 is about 5307.9155042257. The cubic root of 28173967 is about 304.2864876354.

The spelling of 28173967 in words is "twenty-eight million, one hundred seventy-three thousand, nine hundred sixty-seven".