642477008 has 10 divisors (see below), whose sum is σ = 1244799234. Its totient is φ = 321238496.

The previous prime is 642477007. The next prime is 642477029. The reversal of 642477008 is 800774246.

642477008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 352387984 + 290089024 = 18772^2 + 17032^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642477007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20077391 + ... + 20077422.

Almost surely, 2^642477008 is an apocalyptic number.

It is an amenable number.

642477008 is a deficient number, since it is larger than the sum of its proper divisors (602322226).

642477008 is a wasteful number, since it uses less digits than its factorization.

642477008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40154821 (or 40154815 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 642477008 is about 25347.1301728618. The cubic root of 642477008 is about 862.8842264290.

The spelling of 642477008 in words is "six hundred forty-two million, four hundred seventy-seven thousand, eight".