642642426 has 48 divisors (see below), whose sum is σ = 1419859584. Its totient is φ = 210019392.

The previous prime is 642642419. The next prime is 642642461. The reversal of 642642426 is 624246246.

642642426 is a `hidden beast` number, since 6 + 4 + 2 + 642 + 4 + 2 + 6 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 279855 + ... + 282141.

It is an arithmetic number, because the mean of its divisors is an integer number (29580408).

Almost surely, 2^642642426 is an apocalyptic number.

642642426 is an abundant number, since it is smaller than the sum of its proper divisors (777217158).

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

642642426 is a wasteful number, since it uses less digits than its factorization.

642642426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595 (or 2592 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

The square root of 642642426 is about 25350.3930147049. The cubic root of 642642426 is about 862.9582754262.

The spelling of 642642426 in words is "six hundred forty-two million, six hundred forty-two thousand, four hundred twenty-six".