28734191 has 8 divisors (see below), whose sum is σ = 29551104. Its totient is φ = 27924120.

The previous prime is 28734169. The next prime is 28734193. The reversal of 28734191 is 19143782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28734191 - 2¹⁰ = 28733167 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 (28734193) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 7490 + ... + 10656.

It is an arithmetic number, because the mean of its divisors is an integer number (3693888).

Almost surely, 2^28734191 is an apocalyptic number.

28734191 is a deficient number, since it is larger than the sum of its proper divisors (816913).

28734191 is a wasteful number, since it uses less digits than its factorization.

28734191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3421.

The product of its digits is 12096, while the sum is 35.

The square root of 28734191 is about 5360.4282478175. The cubic root of 28734191 is about 306.2901224123.

The spelling of 28734191 in words is "twenty-eight million, seven hundred thirty-four thousand, one hundred ninety-one".