642117226 has 8 divisors (see below), whose sum is σ = 964158624. Its totient is φ = 320731020.

The previous prime is 642117221. The next prime is 642117233. The reversal of 642117226 is 622711246.

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

It is not an unprimeable number, because it can be changed into a prime (642117221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161340 + ... + 165271.

It is an arithmetic number, because the mean of its divisors is an integer number (120519828).

Almost surely, 2^642117226 is an apocalyptic number.

642117226 is a deficient number, since it is larger than the sum of its proper divisors (322041398).

642117226 is a wasteful number, since it uses less digits than its factorization.

642117226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327596.

The product of its digits is 8064, while the sum is 31.

The square root of 642117226 is about 25340.0320836419. The cubic root of 642117226 is about 862.7231269256.

The spelling of 642117226 in words is "six hundred forty-two million, one hundred seventeen thousand, two hundred twenty-six".