28404019240 has 32 divisors (see below), whose sum is σ = 64316121480. Its totient is φ = 11289238272.

The previous prime is 28404019183. The next prime is 28404019249. The reversal of 28404019240 is 4291040482.

It can be written as a sum of positive squares in 4 ways, for example, as 16587894436 + 11816124804 = 128794^2 + 108702^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28404019196 and 28404019205.

It is not an unprimeable number, because it can be changed into a prime (28404019249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2255187 + ... + 2267746.

Almost surely, 2^28404019240 is an apocalyptic number.

28404019240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28404019240 is an abundant number, since it is smaller than the sum of its proper divisors (35912102240).

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

28404019240 is a wasteful number, since it uses less digits than its factorization.

28404019240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4523101 (or 4523097 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The spelling of 28404019240 in words is "twenty-eight billion, four hundred four million, nineteen thousand, two hundred forty".