642135660 has 48 divisors (see below), whose sum is σ = 1800338400. Its totient is φ = 171011584.

The previous prime is 642135653. The next prime is 642135673. The reversal of 642135660 is 66531246.

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, 41926 + ... + 55154.

It is an arithmetic number, because the mean of its divisors is an integer number (37507050).

Almost surely, 2^642135660 is an apocalyptic number.

642135660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642135660 is an abundant number, since it is smaller than the sum of its proper divisors (1158202740).

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

642135660 is a wasteful number, since it uses less digits than its factorization.

642135660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14050 (or 14048 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 642135660 is about 25340.3958137990. The cubic root of 642135660 is about 862.7313825760.

The spelling of 642135660 in words is "six hundred forty-two million, one hundred thirty-five thousand, six hundred sixty".