635406642 has 24 divisors (see below), whose sum is σ = 1482616044. Its totient is φ = 195509664.

The previous prime is 635406631. The next prime is 635406697. The reversal of 635406642 is 246604536.

635406642 is a `hidden beast` number, since 6 + 3 + 5 + 4 + 0 + 6 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 629457921 + 5948721 = 25089^2 + 2439^2 .

635406642 is a modest number, since divided by 6642 gives 6354 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 635406597 and 635406606.

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, 1357473 + ... + 1357940.

Almost surely, 2^635406642 is an apocalyptic number.

635406642 is an abundant number, since it is smaller than the sum of its proper divisors (847209402).

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

635406642 is a wasteful number, since it uses less digits than its factorization.

635406642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715434 (or 2715431 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 635406642 is about 25207.2735931516. The cubic root of 635406642 is about 859.7072385502.

The spelling of 635406642 in words is "six hundred thirty-five million, four hundred six thousand, six hundred forty-two".