28484040 has 192 divisors, whose sum is σ = 100094400. Its totient is φ = 6428160.

The previous prime is 28483991. The next prime is 28484041. The reversal of 28484040 is 4048482.

It is a super-2 number, since 2×28484040² = 1622681069443200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28483989 and 28484007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28484041) 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 47 ways as a sum of consecutive naturals, for example, 918825 + ... + 918855.

It is an arithmetic number, because the mean of its divisors is an integer number (521325).

Almost surely, 2^28484040 is an apocalyptic number.

28484040 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 28484040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50047200).

28484040 is an abundant number, since it is smaller than the sum of its proper divisors (71610360).

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

28484040 is a wasteful number, since it uses less digits than its factorization.

28484040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 73 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 30.

The square root of 28484040 is about 5337.0441257310. The cubic root of 28484040 is about 305.3987081635.

The spelling of 28484040 in words is "twenty-eight million, four hundred eighty-four thousand, forty".