642333213 has 16 divisors (see below), whose sum is σ = 992979840. Its totient is φ = 409603392.

The previous prime is 642333179. The next prime is 642333227. The reversal of 642333213 is 312333246.

It is a happy number.

642333213 is a `hidden beast` number, since 642 + 3 + 3 + 3 + 2 + 13 = 666.

It is not a de Polignac number, because 642333213 - 2⁶ = 642333149 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642353213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516556 + ... + 517797.

It is an arithmetic number, because the mean of its divisors is an integer number (62061240).

Almost surely, 2^642333213 is an apocalyptic number.

It is an amenable number.

642333213 is a deficient number, since it is larger than the sum of its proper divisors (350646627).

642333213 is a wasteful number, since it uses less digits than its factorization.

642333213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034385 (or 1034379 counting only the distinct ones).

The product of its digits is 7776, while the sum is 27.

The square root of 642333213 is about 25344.2934997210. The cubic root of 642333213 is about 862.8198465919.

Adding to 642333213 its reverse (312333246), we get a palindrome (954666459).

The spelling of 642333213 in words is "six hundred forty-two million, three hundred thirty-three thousand, two hundred thirteen".