28106551 has 4 divisors (see below), whose sum is σ = 30661704. Its totient is φ = 25551400.

The previous prime is 28106549. The next prime is 28106591. The reversal of 28106551 is 15560182.

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 28106551 - 2¹ = 28106549 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 (28106521) 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 3 ways as a sum of consecutive naturals, for example, 1277560 + ... + 1277581.

It is an arithmetic number, because the mean of its divisors is an integer number (7665426).

Almost surely, 2^28106551 is an apocalyptic number.

28106551 is a deficient number, since it is larger than the sum of its proper divisors (2555153).

28106551 is a wasteful number, since it uses less digits than its factorization.

28106551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555152.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 28106551 is about 5301.5611851605. The cubic root of 28106551 is about 304.0435900963.

The spelling of 28106551 in words is "twenty-eight million, one hundred six thousand, five hundred fifty-one".