28420059978 has 80 divisors (see below), whose sum is σ = 67471652160. Its totient is φ = 8910324864.

The previous prime is 28420059953. The next prime is 28420060007. The reversal of 28420059978 is 87995002482.

28420059978 is a `hidden beast` number, since 2 + 8 + 42 + 0 + 0 + 599 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6670813 + ... + 6675071.

It is an arithmetic number, because the mean of its divisors is an integer number (843395652).

Almost surely, 2^28420059978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28420059978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33735826080).

28420059978 is an abundant number, since it is smaller than the sum of its proper divisors (39051592182).

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

28420059978 is a wasteful number, since it uses less digits than its factorization.

28420059978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6713 (or 6704 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 28420059978 in words is "twenty-eight billion, four hundred twenty million, fifty-nine thousand, nine hundred seventy-eight".