28280040 has 64 divisors (see below), whose sum is σ = 85190400. Its totient is φ = 7510272.

The previous prime is 28279997. The next prime is 28280047. The reversal of 28280040 is 4008282.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (28280047) 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 15 ways as a sum of consecutive naturals, for example, 55306 + ... + 55814.

It is an arithmetic number, because the mean of its divisors is an integer number (1331100).

Almost surely, 2^28280040 is an apocalyptic number.

28280040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28280040 is an abundant number, since it is smaller than the sum of its proper divisors (56910360).

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

28280040 is a wasteful number, since it uses less digits than its factorization.

28280040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986 (or 982 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28280040 is about 5317.8980810091. The cubic root of 28280040 is about 304.6678817875.

The spelling of 28280040 in words is "twenty-eight million, two hundred eighty thousand, forty".