28009760 has 24 divisors (see below), whose sum is σ = 66173436. Its totient is φ = 11203840.

The previous prime is 28009753. The next prime is 28009769. The reversal of 28009760 is 6790082.

It can be written as a sum of positive squares in 2 ways, for example, as 23464336 + 4545424 = 4844^2 + 2132^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is not an unprimeable number, because it can be changed into a prime (28009769) 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, 87371 + ... + 87690.

Almost surely, 2^28009760 is an apocalyptic number.

28009760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28009760 is an abundant number, since it is smaller than the sum of its proper divisors (38163676).

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

28009760 is a wasteful number, since it uses less digits than its factorization.

28009760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175076 (or 175068 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28009760 is about 5292.4247750913. The cubic root of 28009760 is about 303.6941753608.

The spelling of 28009760 in words is "twenty-eight million, nine thousand, seven hundred sixty".