28020324240 has 60 divisors (see below), whose sum is σ = 94101591324. Its totient is φ = 7472086272.

The previous prime is 28020324229. The next prime is 28020324247. The reversal of 28020324240 is 4242302082.

28020324240 is a `hidden beast` number, since 2 + 80 + 20 + 324 + 240 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14193386496 + 13826937744 = 119136^2 + 117588^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is not an unprimeable number, because it can be changed into a prime (28020324247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19457839 + ... + 19459278.

Almost surely, 2^28020324240 is an apocalyptic number.

28020324240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28020324240 is an abundant number, since it is smaller than the sum of its proper divisors (66081267084).

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

28020324240 is a wasteful number, since it uses less digits than its factorization.

28020324240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38917136 (or 38917127 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The spelling of 28020324240 in words is "twenty-eight billion, twenty million, three hundred twenty-four thousand, two hundred forty".