28400560 has 20 divisors (see below), whose sum is σ = 66031488. Its totient is φ = 11360192.

The previous prime is 28400543. The next prime is 28400569. The reversal of 28400560 is 6500482.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (28400569) 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 3 ways as a sum of consecutive naturals, for example, 177424 + ... + 177583.

Almost surely, 2^28400560 is an apocalyptic number.

28400560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28400560 is an abundant number, since it is smaller than the sum of its proper divisors (37630928).

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

28400560 is a wasteful number, since it uses less digits than its factorization.

28400560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355020 (or 355014 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28400560 is about 5329.2175785944. The cubic root of 28400560 is about 305.1000657062.

The spelling of 28400560 in words is "twenty-eight million, four hundred thousand, five hundred sixty".