28443301920 has 144 divisors (see below), whose sum is σ = 105886714752. Its totient is φ = 6895342080.

The previous prime is 28443301907. The next prime is 28443301961. The reversal of 28443301920 is 2910334482.

28443301920 is a `hidden beast` number, since 28 + 443 + 3 + 0 + 192 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×28443301920² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 881992 + ... + 913671.

It is an arithmetic number, because the mean of its divisors is an integer number (735324408).

Almost surely, 2^28443301920 is an apocalyptic number.

28443301920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28443301920 is an abundant number, since it is smaller than the sum of its proper divisors (77443412832).

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

28443301920 is a wasteful number, since it uses less digits than its factorization.

28443301920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795695 (or 1795684 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 28443301920 in words is "twenty-eight billion, four hundred forty-three million, three hundred one thousand, nine hundred twenty".