642539616 has 48 divisors (see below), whose sum is σ = 1785886704. Its totient is φ = 201580544.

The previous prime is 642539539. The next prime is 642539629. The reversal of 642539616 is 616935246.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195225 + ... + 198488.

It is an arithmetic number, because the mean of its divisors is an integer number (37205973).

Almost surely, 2^642539616 is an apocalyptic number.

It is an amenable number.

642539616 is an abundant number, since it is smaller than the sum of its proper divisors (1143347088).

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

642539616 is a wasteful number, since it uses less digits than its factorization.

642539616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393743 (or 393735 counting only the distinct ones).

The product of its digits is 233280, while the sum is 42.

The square root of 642539616 is about 25348.3651543842. The cubic root of 642539616 is about 862.9122542547.

The spelling of 642539616 in words is "six hundred forty-two million, five hundred thirty-nine thousand, six hundred sixteen".