428509636 has 12 divisors (see below), whose sum is σ = 750113728. Its totient is φ = 214191432.

The previous prime is 428509591. The next prime is 428509639. The reversal of 428509636 is 636905824.

It is a junction number, because it is equal to n+sod(n) for n = 428509592 and 428509601.

It is not an unprimeable number, because it can be changed into a prime (428509639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1465 + ... + 29311.

Almost surely, 2^428509636 is an apocalyptic number.

It is an amenable number.

428509636 is a deficient number, since it is larger than the sum of its proper divisors (321604092).

428509636 is a wasteful number, since it uses less digits than its factorization.

428509636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31698 (or 31696 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 428509636 is about 20700.4742940832. The cubic root of 428509636 is about 753.9112040033.

The spelling of 428509636 in words is "four hundred twenty-eight million, five hundred nine thousand, six hundred thirty-six".