28427320 has 16 divisors (see below), whose sum is σ = 63961560. Its totient is φ = 11370912.

The previous prime is 28427303. The next prime is 28427327. The reversal of 28427320 is 2372482.

It is a super-2 number, since 2×28427320² = 1616225044764800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28427327) 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 3 ways as a sum of consecutive naturals, for example, 355302 + ... + 355381.

Almost surely, 2^28427320 is an apocalyptic number.

28427320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28427320 is an abundant number, since it is smaller than the sum of its proper divisors (35534240).

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

28427320 is a wasteful number, since it uses less digits than its factorization.

28427320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710694 (or 710690 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 28427320 is about 5331.7276749662. The cubic root of 28427320 is about 305.1958609396.

The spelling of 28427320 in words is "twenty-eight million, four hundred twenty-seven thousand, three hundred twenty".