642711552 has 136 divisors (see below), whose sum is σ = 1962919296. Its totient is φ = 183238656.

The previous prime is 642711541. The next prime is 642711593. The reversal of 642711552 is 255117246.

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, 1376023 + ... + 1376489.

Almost surely, 2^642711552 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 642711552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (981459648).

642711552 is an abundant number, since it is smaller than the sum of its proper divisors (1320207744).

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

642711552 is an frugal number, since it uses more digits than its factorization.

642711552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 479 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 642711552 is about 25351.7563888580. The cubic root of 642711552 is about 862.9892157608.

Adding to 642711552 its reverse (255117246), we get a palindrome (897828798).

The spelling of 642711552 in words is "six hundred forty-two million, seven hundred eleven thousand, five hundred fifty-two".