642571752 has 32 divisors (see below), whose sum is σ = 1607316480. Its totient is φ = 214072320.

The previous prime is 642571693. The next prime is 642571753. The reversal of 642571752 is 257175246.

It is a self number, because there is not a number n which added to its sum of digits gives 642571752.

It is not an unprimeable number, because it can be changed into a prime (642571753) 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, 44377 + ... + 57047.

It is an arithmetic number, because the mean of its divisors is an integer number (50228640).

Almost surely, 2^642571752 is an apocalyptic number.

It is an amenable number.

642571752 is an abundant number, since it is smaller than the sum of its proper divisors (964744728).

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

642571752 is a wasteful number, since it uses less digits than its factorization.

642571752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14793 (or 14789 counting only the distinct ones).

The product of its digits is 117600, while the sum is 39.

The square root of 642571752 is about 25348.9990334924. Note that the first 3 decimals coincide. The cubic root of 642571752 is about 862.9266399233.

The spelling of 642571752 in words is "six hundred forty-two million, five hundred seventy-one thousand, seven hundred fifty-two".