28420986 has 64 divisors (see below), whose sum is σ = 66355200. Its totient is φ = 8030400.

The previous prime is 28420967. The next prime is 28420999. The reversal of 28420986 is 68902482.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59095 + ... + 59573.

It is an arithmetic number, because the mean of its divisors is an integer number (1036800).

Almost surely, 2^28420986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28420986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33177600).

28420986 is an abundant number, since it is smaller than the sum of its proper divisors (37934214).

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

28420986 is a wasteful number, since it uses less digits than its factorization.

28420986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 28420986 is about 5331.1336505475. The cubic root of 28420986 is about 305.1731919698.

The spelling of 28420986 in words is "twenty-eight million, four hundred twenty thousand, nine hundred eighty-six".