28580440 has 64 divisors (see below), whose sum is σ = 74280960. Its totient is φ = 9694080.

The previous prime is 28580429. The next prime is 28580441. The reversal of 28580440 is 4408582.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28580441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28345 + ... + 29335.

It is an arithmetic number, because the mean of its divisors is an integer number (1160640).

Almost surely, 2^28580440 is an apocalyptic number.

28580440 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 28580440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37140480).

28580440 is an abundant number, since it is smaller than the sum of its proper divisors (45700520).

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

28580440 is a wasteful number, since it uses less digits than its factorization.

28580440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1108 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 31.

The square root of 28580440 is about 5346.0677137500. The cubic root of 28580440 is about 305.7428457403.

The spelling of 28580440 in words is "twenty-eight million, five hundred eighty thousand, four hundred forty".