428638536 has 48 divisors (see below), whose sum is σ = 1166010300. Its totient is φ = 142250112.

The previous prime is 428638453. The next prime is 428638541. The reversal of 428638536 is 635836824.

It is a happy number.

428638536 is a `hidden beast` number, since 4 + 2 + 8 + 638 + 5 + 3 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 428241636 + 396900 = 20694^2 + 630^2 .

It is a junction number, because it is equal to n+sod(n) for n = 428638491 and 428638500.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3490 + ... + 29486.

Almost surely, 2^428638536 is an apocalyptic number.

It is an amenable number.

428638536 is an abundant number, since it is smaller than the sum of its proper divisors (737371764).

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

428638536 is a wasteful number, since it uses less digits than its factorization.

428638536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26238 (or 26231 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 428638536 is about 20703.5875152110. The cubic root of 428638536 is about 753.9867911107.

The spelling of 428638536 in words is "four hundred twenty-eight million, six hundred thirty-eight thousand, five hundred thirty-six".