642571748 has 48 divisors (see below), whose sum is σ = 1421435904. Its totient is φ = 247328640.

The previous prime is 642571693. The next prime is 642571753. The reversal of 642571748 is 847175246.

It is a junction number, because it is equal to n+sod(n) for n = 642571699 and 642571708.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10388 + ... + 37323.

It is an arithmetic number, because the mean of its divisors is an integer number (29613248).

Almost surely, 2^642571748 is an apocalyptic number.

It is an amenable number.

642571748 is an abundant number, since it is smaller than the sum of its proper divisors (778864156).

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

642571748 is a wasteful number, since it uses less digits than its factorization.

642571748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47772 (or 47770 counting only the distinct ones).

The product of its digits is 376320, while the sum is 44.

The square root of 642571748 is about 25348.9989545938. The cubic root of 642571748 is about 862.9266381328.

The spelling of 642571748 in words is "six hundred forty-two million, five hundred seventy-one thousand, seven hundred forty-eight".