642716784 has 60 divisors (see below), whose sum is σ = 1876928976. Its totient is φ = 204923136.

The previous prime is 642716783. The next prime is 642716813. The reversal of 642716784 is 487617246.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642716783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93717 + ... + 100340.

Almost surely, 2^642716784 is an apocalyptic number.

It is an amenable number.

642716784 is an abundant number, since it is smaller than the sum of its proper divisors (1234212192).

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

642716784 is a wasteful number, since it uses less digits than its factorization.

642716784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194094 (or 194085 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 642716784 is about 25351.8595767648. The cubic root of 642716784 is about 862.9915574787.

The spelling of 642716784 in words is "six hundred forty-two million, seven hundred sixteen thousand, seven hundred eighty-four".