28322840 has 128 divisors (see below), whose sum is σ = 81285120. Its totient is φ = 8640000.

The previous prime is 28322839. The next prime is 28322851. The reversal of 28322840 is 4822382.

28322840 = T₃₄₄ + T₃₄₅ + ... + T₅₉₄.

It is a congruent 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, 112715 + ... + 112965.

It is an arithmetic number, because the mean of its divisors is an integer number (635040).

Almost surely, 2^28322840 is an apocalyptic number.

28322840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28322840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40642560).

28322840 is an abundant number, since it is smaller than the sum of its proper divisors (52962280).

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

28322840 is a wasteful number, since it uses less digits than its factorization.

28322840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28322840 is about 5321.9207059106. The cubic root of 28322840 is about 304.8215026520.

The spelling of 28322840 in words is "twenty-eight million, three hundred twenty-two thousand, eight hundred forty".