642072426 has 8 divisors (see below), whose sum is σ = 1284144864. Its totient is φ = 214024140.

The previous prime is 642072407. The next prime is 642072443. The reversal of 642072426 is 624270246.

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

642072426 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53506030 + ... + 53506041.

It is an arithmetic number, because the mean of its divisors is an integer number (160518108).

Almost surely, 2^642072426 is an apocalyptic number.

642072426 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.

642072426 is a wasteful number, since it uses less digits than its factorization.

642072426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107012076.

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 642072426 is about 25339.1480914414. The cubic root of 642072426 is about 862.7030626272.

The spelling of 642072426 in words is "six hundred forty-two million, seventy-two thousand, four hundred twenty-six".