642019326 has 64 divisors (see below), whose sum is σ = 1436590848. Its totient is φ = 190003968.

The previous prime is 642019321. The next prime is 642019349. The reversal of 642019326 is 623910246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642019321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 223290 + ... + 226146.

It is an arithmetic number, because the mean of its divisors is an integer number (22446732).

Almost surely, 2^642019326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642019326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718295424).

642019326 is an abundant number, since it is smaller than the sum of its proper divisors (794571522).

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

642019326 is a wasteful number, since it uses less digits than its factorization.

642019326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2985.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 642019326 is about 25338.1002839597. The cubic root of 642019326 is about 862.6792798504.

The spelling of 642019326 in words is "six hundred forty-two million, nineteen thousand, three hundred twenty-six".