642403734 has 16 divisors (see below), whose sum is σ = 1468351488. Its totient is φ = 183543912.

The previous prime is 642403721. The next prime is 642403739. The reversal of 642403734 is 437304246.

It is a junction number, because it is equal to n+sod(n) for n = 642403695 and 642403704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642403739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7647622 + ... + 7647705.

It is an arithmetic number, because the mean of its divisors is an integer number (91771968).

Almost surely, 2^642403734 is an apocalyptic number.

642403734 is an abundant number, since it is smaller than the sum of its proper divisors (825947754).

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

642403734 is a wasteful number, since it uses less digits than its factorization.

642403734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15295339.

The product of its (nonzero) digits is 48384, while the sum is 33.

The square root of 642403734 is about 25345.6847214669. The cubic root of 642403734 is about 862.8514214249.

The spelling of 642403734 in words is "six hundred forty-two million, four hundred three thousand, seven hundred thirty-four".