428109066 has 96 divisors (see below), whose sum is σ = 1160640000. Its totient is φ = 110795040.

The previous prime is 428109023. The next prime is 428109067. The reversal of 428109066 is 660901824.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 428109066.

It is not an unprimeable number, because it can be changed into a prime (428109067) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 691305 + ... + 691923.

It is an arithmetic number, because the mean of its divisors is an integer number (12090000).

Almost surely, 2^428109066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428109066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (580320000).

428109066 is an abundant number, since it is smaller than the sum of its proper divisors (732530934).

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

428109066 is a wasteful number, since it uses less digits than its factorization.

428109066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144 (or 1141 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 428109066 is about 20690.7966497184. The cubic root of 428109066 is about 753.6762125074.

The spelling of 428109066 in words is "four hundred twenty-eight million, one hundred nine thousand, sixty-six".