28427586 has 64 divisors (see below), whose sum is σ = 65995776. Its totient is φ = 8078400.

The previous prime is 28427573. The next prime is 28427593. The reversal of 28427586 is 68572482.

It is a happy number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 92445 + ... + 92751.

It is an arithmetic number, because the mean of its divisors is an integer number (1031184).

Almost surely, 2^28427586 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28427586, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32997888).

28427586 is an abundant number, since it is smaller than the sum of its proper divisors (37568190).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28427586 is a wasteful number, since it uses less digits than its factorization.

28427586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407.

The product of its digits is 215040, while the sum is 42.

The square root of 28427586 is about 5331.7526199178. The cubic root of 28427586 is about 305.1968128624.

Subtracting 28427586 from its reverse (68572482), we obtain a square (40144896 = 6336²).

The spelling of 28427586 in words is "twenty-eight million, four hundred twenty-seven thousand, five hundred eighty-six".