642666760 has 32 divisors (see below), whose sum is σ = 1446724800. Its totient is φ = 256937920.

The previous prime is 642666757. The next prime is 642666769. The reversal of 642666760 is 67666246.

It is not an unprimeable number, because it can be changed into a prime (642666769) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 144165 + ... + 148555.

It is an arithmetic number, because the mean of its divisors is an integer number (45210150).

Almost surely, 2^642666760 is an apocalyptic number.

It is an amenable number.

642666760 is an abundant number, since it is smaller than the sum of its proper divisors (804058040).

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

642666760 is a wasteful number, since it uses less digits than its factorization.

642666760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8061 (or 8057 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 43.

The square root of 642666760 is about 25350.8729632729. The cubic root of 642666760 is about 862.9691674147.

The spelling of 642666760 in words is "six hundred forty-two million, six hundred sixty-six thousand, seven hundred sixty".