642514784 has 24 divisors (see below), whose sum is σ = 1282771728. Its totient is φ = 316731520.

The previous prime is 642514753. The next prime is 642514787. The reversal of 642514784 is 487415246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642514787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139127 + ... + 143670.

It is an arithmetic number, because the mean of its divisors is an integer number (53448822).

Almost surely, 2^642514784 is an apocalyptic number.

It is an amenable number.

642514784 is a deficient number, since it is larger than the sum of its proper divisors (640256944).

642514784 is a wasteful number, since it uses less digits than its factorization.

642514784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282878 (or 282870 counting only the distinct ones).

The product of its digits is 215040, while the sum is 41.

The square root of 642514784 is about 25347.8753350256. The cubic root of 642514784 is about 862.9011378905.

The spelling of 642514784 in words is "six hundred forty-two million, five hundred fourteen thousand, seven hundred eighty-four".