642043064 has 64 divisors (see below), whose sum is σ = 1349308800. Its totient is φ = 284368896.

The previous prime is 642043043. The next prime is 642043069. The reversal of 642043064 is 460340246.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642043069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 581537 + ... + 582639.

It is an arithmetic number, because the mean of its divisors is an integer number (21082950).

Almost surely, 2^642043064 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642043064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (674654400).

642043064 is an abundant number, since it is smaller than the sum of its proper divisors (707265736).

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

642043064 is a wasteful number, since it uses less digits than its factorization.

642043064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344 (or 1340 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 642043064 is about 25338.5687046447. The cubic root of 642043064 is about 862.6899119439.

The spelling of 642043064 in words is "six hundred forty-two million, forty-three thousand, sixty-four".