28020460640 has 24 divisors (see below), whose sum is σ = 66198338640. Its totient is φ = 11208184192.

The previous prime is 28020460607. The next prime is 28020460651. The reversal of 28020460640 is 4606402082.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 28020460597 and 28020460606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87563780 + ... + 87564099.

It is an arithmetic number, because the mean of its divisors is an integer number (2758264110).

Almost surely, 2^28020460640 is an apocalyptic number.

28020460640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28020460640 is an abundant number, since it is smaller than the sum of its proper divisors (38177878000).

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

28020460640 is a wasteful number, since it uses less digits than its factorization.

28020460640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175127894 (or 175127886 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The spelling of 28020460640 in words is "twenty-eight billion, twenty million, four hundred sixty thousand, six hundred forty".