642051626 has 8 divisors (see below), whose sum is σ = 963218784. Its totient is φ = 320978700.

The previous prime is 642051617. The next prime is 642051637. The reversal of 642051626 is 626150246.

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

It is a junction number, because it is equal to n+sod(n) for n = 642051592 and 642051601.

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, 2900 + ... + 35951.

It is an arithmetic number, because the mean of its divisors is an integer number (120402348).

Almost surely, 2^642051626 is an apocalyptic number.

642051626 is a deficient number, since it is larger than the sum of its proper divisors (321167158).

642051626 is a wasteful number, since it uses less digits than its factorization.

642051626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47116.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 642051626 is about 25338.7376560080. The cubic root of 642051626 is about 862.6937467428.

The spelling of 642051626 in words is "six hundred forty-two million, fifty-one thousand, six hundred twenty-six".