28279446 has 36 divisors (see below), whose sum is σ = 61613172. Its totient is φ = 8649264.

The previous prime is 28279441. The next prime is 28279451. The reversal of 28279446 is 64497282.

It is an interprime number because it is at equal distance from previous prime (28279441) and next prime (28279451).

It is a super-3 number, since 3×28279446³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28279398 and 28279407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28279441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 169255 + ... + 169421.

It is an arithmetic number, because the mean of its divisors is an integer number (1711477).

Almost surely, 2^28279446 is an apocalyptic number.

28279446 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28279446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30806586).

28279446 is an abundant number, since it is smaller than the sum of its proper divisors (33333726).

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

28279446 is a wasteful number, since it uses less digits than its factorization.

28279446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 185 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 28279446 is about 5317.8422315823. The cubic root of 28279446 is about 304.6657486695.

The spelling of 28279446 in words is "twenty-eight million, two hundred seventy-nine thousand, four hundred forty-six".