28112206440 has 32 divisors (see below), whose sum is σ = 84336619680. Its totient is φ = 7496588352.

The previous prime is 28112206361. The next prime is 28112206469. The reversal of 28112206440 is 4460221182.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28112206398 and 28112206407.

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, 117134074 + ... + 117134313.

It is an arithmetic number, because the mean of its divisors is an integer number (2635519365).

Almost surely, 2^28112206440 is an apocalyptic number.

28112206440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28112206440 is an abundant number, since it is smaller than the sum of its proper divisors (56224413240).

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

28112206440 is a wasteful number, since it uses less digits than its factorization.

28112206440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234268401 (or 234268397 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The spelling of 28112206440 in words is "twenty-eight billion, one hundred twelve million, two hundred six thousand, four hundred forty".