428229690 has 128 divisors (see below), whose sum is σ = 1228677120. Its totient is φ = 93477888.

The previous prime is 428229667. The next prime is 428229701. The reversal of 428229690 is 96922824.

It is a super-2 number, since 2×428229690² = 366761334794992200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 423906 + ... + 424914.

It is an arithmetic number, because the mean of its divisors is an integer number (9599040).

Almost surely, 2^428229690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 428229690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (614338560).

428229690 is an abundant number, since it is smaller than the sum of its proper divisors (800447430).

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

428229690 is a wasteful number, since it uses less digits than its factorization.

428229690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 428229690 is about 20693.7113636003. The cubic root of 428229690 is about 753.7469911241.

The spelling of 428229690 in words is "four hundred twenty-eight million, two hundred twenty-nine thousand, six hundred ninety".