642539604 has 96 divisors (see below), whose sum is σ = 1775886336. Its totient is φ = 176941440.

The previous prime is 642539539. The next prime is 642539629. The reversal of 642539604 is 406935246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1153294 + ... + 1153850.

It is an arithmetic number, because the mean of its divisors is an integer number (18498816).

Almost surely, 2^642539604 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 642539604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887943168).

642539604 is an abundant number, since it is smaller than the sum of its proper divisors (1133346732).

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

642539604 is a wasteful number, since it uses less digits than its factorization.

642539604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 642539604 is about 25348.3649176826. The cubic root of 642539604 is about 862.9122488829.

The spelling of 642539604 in words is "six hundred forty-two million, five hundred thirty-nine thousand, six hundred four".