642267426 has 8 divisors (see below), whose sum is σ = 1284534864. Its totient is φ = 214089140.

The previous prime is 642267407. The next prime is 642267443. The reversal of 642267426 is 624762246.

It is a sphenic number, since it is the product of 3 distinct primes.

642267426 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53522280 + ... + 53522291.

It is an arithmetic number, because the mean of its divisors is an integer number (160566858).

Almost surely, 2^642267426 is an apocalyptic number.

642267426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

642267426 is a wasteful number, since it uses less digits than its factorization.

642267426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107044576.

The product of its digits is 193536, while the sum is 39.

The square root of 642267426 is about 25342.9956003626. The cubic root of 642267426 is about 862.7903892604.

The spelling of 642267426 in words is "six hundred forty-two million, two hundred sixty-seven thousand, four hundred twenty-six".