28372986 has 12 divisors (see below), whose sum is σ = 61474842. Its totient is φ = 9457656.

The previous prime is 28372979. The next prime is 28372997. The reversal of 28372986 is 68927382.

It can be written as a sum of positive squares in only one way, i.e., 28291761 + 81225 = 5319^2 + 285^2 .

It is a Curzon number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 788121 + ... + 788156.

Almost surely, 2^28372986 is an apocalyptic number.

28372986 is an abundant number, since it is smaller than the sum of its proper divisors (33101856).

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

28372986 is a wasteful number, since it uses less digits than its factorization.

28372986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576285 (or 1576282 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28372986 is about 5326.6298914041. The cubic root of 28372986 is about 305.0012935536.

The spelling of 28372986 in words is "twenty-eight million, three hundred seventy-two thousand, nine hundred eighty-six".