642464226 has 24 divisors (see below), whose sum is σ = 1429629084. Its totient is φ = 208366560.

The previous prime is 642464213. The next prime is 642464227. The reversal of 642464226 is 622464246.

642464226 is a `hidden beast` number, since 6 + 4 + 2 + 4 + 642 + 2 + 6 = 666.

642464226 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 625250025 + 17214201 = 25005^2 + 4149^2 .

It is not an unprimeable number, because it can be changed into a prime (642464227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481665 + ... + 482996.

Almost surely, 2^642464226 is an apocalyptic number.

642464226 is an abundant number, since it is smaller than the sum of its proper divisors (787164858).

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

642464226 is a wasteful number, since it uses less digits than its factorization.

642464226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964706 (or 964703 counting only the distinct ones).

The product of its digits is 110592, while the sum is 36.

The square root of 642464226 is about 25346.8780326099. The cubic root of 642464226 is about 862.8785040663.

The spelling of 642464226 in words is "six hundred forty-two million, four hundred sixty-four thousand, two hundred twenty-six".