428164444881 has 80 divisors (see below), whose sum is σ = 660471356160. Its totient is φ = 276250417920.

The previous prime is 428164444879. The next prime is 428164444891. The reversal of 428164444881 is 188444461824.

428164444881 is a `hidden beast` number, since 4 + 2 + 81 + 6 + 44 + 448 + 81 = 666.

428164444881 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 428164444881 - 2¹ = 428164444879 is a prime.

It is a super-2 number, since 2×428164444881² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (428164444861) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 388181176 + ... + 388182278.

It is an arithmetic number, because the mean of its divisors is an integer number (8255891952).

Almost surely, 2^428164444881 is an apocalyptic number.

428164444881 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

428164444881 is a deficient number, since it is larger than the sum of its proper divisors (232306911279).

428164444881 is a wasteful number, since it uses less digits than its factorization.

428164444881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988 (or 1979 counting only the distinct ones).

The product of its digits is 6291456, while the sum is 54.

The spelling of 428164444881 in words is "four hundred twenty-eight billion, one hundred sixty-four million, four hundred forty-four thousand, eight hundred eighty-one".