1642440768 has 28 divisors (see below), whose sum is σ = 4345625040. Its totient is φ = 547480192.

The previous prime is 1642440749. The next prime is 1642440773. The reversal of 1642440768 is 8670442461.

It is a super-3 number, since 3×1642440768³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4276998 + ... + 4277381.

Almost surely, 2^1642440768 is an apocalyptic number.

It is an amenable number.

1642440768 is an abundant number, since it is smaller than the sum of its proper divisors (2703184272).

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

1642440768 is an equidigital number, since it uses as much as digits as its factorization.

1642440768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8554394 (or 8554384 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 42.

The square root of 1642440768 is about 40527.0374935055. The cubic root of 1642440768 is about 1179.8584451473.

The spelling of 1642440768 in words is "one billion, six hundred forty-two million, four hundred forty thousand, seven hundred sixty-eight".