642741226 has 8 divisors (see below), whose sum is σ = 964274724. Its totient is φ = 321316320.

The previous prime is 642741223. The next prime is 642741283. The reversal of 642741226 is 622147246.

It can be written as a sum of positive squares in 2 ways, for example, as 473715225 + 169026001 = 21765^2 + 13001^2 .

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 = 642741191 and 642741200.

It is not an unprimeable number, because it can be changed into a prime (642741223) 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, 10245 + ... + 37288.

Almost surely, 2^642741226 is an apocalyptic number.

642741226 is a deficient number, since it is larger than the sum of its proper divisors (321533498).

642741226 is a wasteful number, since it uses less digits than its factorization.

642741226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54296.

The product of its digits is 32256, while the sum is 34.

The square root of 642741226 is about 25352.3416275499. The cubic root of 642741226 is about 863.0024969639.

The spelling of 642741226 in words is "six hundred forty-two million, seven hundred forty-one thousand, two hundred twenty-six".