642722654 has 16 divisors (see below), whose sum is σ = 1102207200. Its totient is φ = 275353344.

The previous prime is 642722653. The next prime is 642722687. The reversal of 642722654 is 456227246.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642722653) 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 7 ways as a sum of consecutive naturals, for example, 42902 + ... + 55910.

It is an arithmetic number, because the mean of its divisors is an integer number (68887950).

Almost surely, 2^642722654 is an apocalyptic number.

642722654 is a deficient number, since it is larger than the sum of its proper divisors (459484546).

642722654 is a wasteful number, since it uses less digits than its factorization.

642722654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16547.

The product of its digits is 161280, while the sum is 38.

The square root of 642722654 is about 25351.9753471007. The cubic root of 642722654 is about 862.9941847349.

The spelling of 642722654 in words is "six hundred forty-two million, seven hundred twenty-two thousand, six hundred fifty-four".