428181828 has 12 divisors (see below), whose sum is σ = 999090960. Its totient is φ = 142727272.

The previous prime is 428181799. The next prime is 428181829. The reversal of 428181828 is 828181824.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 428181828.

It is not an unprimeable number, because it can be changed into a prime (428181829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17840898 + ... + 17840921.

It is an arithmetic number, because the mean of its divisors is an integer number (83257580).

Almost surely, 2^428181828 is an apocalyptic number.

It is an amenable number.

428181828 is an abundant number, since it is smaller than the sum of its proper divisors (570909132).

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

428181828 is a wasteful number, since it uses less digits than its factorization.

428181828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35681826 (or 35681824 counting only the distinct ones).

The product of its digits is 65536, while the sum is 42.

The square root of 428181828 is about 20692.5548930044. The cubic root of 428181828 is about 753.7189087005.

The spelling of 428181828 in words is "four hundred twenty-eight million, one hundred eighty-one thousand, eight hundred twenty-eight".