28246087 has 4 divisors (see below), whose sum is σ = 29220120. Its totient is φ = 27272056.

The previous prime is 28246081. The next prime is 28246091. The reversal of 28246087 is 78064282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28246087 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 (28246081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486973 + ... + 487030.

It is an arithmetic number, because the mean of its divisors is an integer number (7305030).

Almost surely, 2^28246087 is an apocalyptic number.

28246087 is a deficient number, since it is larger than the sum of its proper divisors (974033).

28246087 is an equidigital number, since it uses as much as digits as its factorization.

28246087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974032.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 28246087 is about 5314.7047895438. The cubic root of 28246087 is about 304.5459049306.

It can be divided in two parts, 2824 and 6087, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 28246087 in words is "twenty-eight million, two hundred forty-six thousand, eighty-seven".