28784406 has 64 divisors (see below), whose sum is σ = 68387328. Its totient is φ = 7907328.

The previous prime is 28784381. The next prime is 28784407. The reversal of 28784406 is 60448782.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28784407) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149046 + ... + 149238.

It is an arithmetic number, because the mean of its divisors is an integer number (1068552).

Almost surely, 2^28784406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28784406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34193664).

28784406 is an abundant number, since it is smaller than the sum of its proper divisors (39602922).

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

28784406 is a wasteful number, since it uses less digits than its factorization.

28784406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 28784406 is about 5365.1100641087. The cubic root of 28784406 is about 306.4684396856.

The spelling of 28784406 in words is "twenty-eight million, seven hundred eighty-four thousand, four hundred six".