28420807944 has 48 divisors (see below), whose sum is σ = 75477423600. Its totient is φ = 8916329728.

The previous prime is 28420807901. The next prime is 28420807949. The reversal of 28420807944 is 44970802482.

It is a junction number, because it is equal to n+sod(n) for n = 28420807893 and 28420807902.

It is not an unprimeable number, because it can be changed into a prime (28420807949) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2041854 + ... + 2055725.

It is an arithmetic number, because the mean of its divisors is an integer number (1572446325).

Almost surely, 2^28420807944 is an apocalyptic number.

28420807944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28420807944 is an abundant number, since it is smaller than the sum of its proper divisors (47056615656).

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

28420807944 is a wasteful number, since it uses less digits than its factorization.

28420807944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097622 (or 4097601 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 28420807944 in words is "twenty-eight billion, four hundred twenty million, eight hundred seven thousand, nine hundred forty-four".