642527688 has 32 divisors (see below), whose sum is σ = 1752348960. Its totient is φ = 194705280.

The previous prime is 642527663. The next prime is 642527707. The reversal of 642527688 is 886725246.

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, 1216645 + ... + 1217172.

It is an arithmetic number, because the mean of its divisors is an integer number (54760905).

Almost surely, 2^642527688 is an apocalyptic number.

It is an amenable number.

642527688 is an abundant number, since it is smaller than the sum of its proper divisors (1109821272).

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

642527688 is a wasteful number, since it uses less digits than its factorization.

642527688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433837 (or 2433833 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 48.

The square root of 642527688 is about 25348.1298718466. The cubic root of 642527688 is about 862.9069145679.

The spelling of 642527688 in words is "six hundred forty-two million, five hundred twenty-seven thousand, six hundred eighty-eight".