28172134 has 4 divisors (see below), whose sum is σ = 42258204. Its totient is φ = 14086066.

The previous prime is 28172069. The next prime is 28172147. The reversal of 28172134 is 43127182.

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

It is a super-2 number, since 2×28172134² = 1587338268227912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7043032 + ... + 7043035.

It is an arithmetic number, because the mean of its divisors is an integer number (10564551).

Almost surely, 2^28172134 is an apocalyptic number.

28172134 is a deficient number, since it is larger than the sum of its proper divisors (14086070).

28172134 is a wasteful number, since it uses less digits than its factorization.

28172134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14086069.

The product of its digits is 2688, while the sum is 28.

The square root of 28172134 is about 5307.7428347651. The cubic root of 28172134 is about 304.2798885265.

The spelling of 28172134 in words is "twenty-eight million, one hundred seventy-two thousand, one hundred thirty-four".