28427331840 has 144 divisors (see below), whose sum is σ = 95568446400. Its totient is φ = 7181623296.

The previous prime is 28427331833. The next prime is 28427331887. The reversal of 28427331840 is 4813372482.

It is a happy number.

It is a super-2 number, since 2×28427331840² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28427331792 and 28427331801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121855 + ... + 267774.

Almost surely, 2^28427331840 is an apocalyptic number.

28427331840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28427331840 is an abundant number, since it is smaller than the sum of its proper divisors (67141114560).

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

28427331840 is a wasteful number, since it uses less digits than its factorization.

28427331840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389672 (or 389658 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 42.

The spelling of 28427331840 in words is "twenty-eight billion, four hundred twenty-seven million, three hundred thirty-one thousand, eight hundred forty".