28075220240 has 40 divisors (see below), whose sum is σ = 65291992920. Its totient is φ = 11227145216.

The previous prime is 28075220237. The next prime is 28075220267. The reversal of 28075220240 is 4202257082.

It can be written as a sum of positive squares in 4 ways, for example, as 9907415296 + 18167804944 = 99536^2 + 134788^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 28075220197 and 28075220206.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275132 + ... + 363108.

It is an arithmetic number, because the mean of its divisors is an integer number (1632299823).

Almost surely, 2^28075220240 is an apocalyptic number.

28075220240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28075220240 is an abundant number, since it is smaller than the sum of its proper divisors (37216772680).

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

28075220240 is a wasteful number, since it uses less digits than its factorization.

28075220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91979 (or 91973 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The spelling of 28075220240 in words is "twenty-eight billion, seventy-five million, two hundred twenty thousand, two hundred forty".