642473464 has 8 divisors (see below), whose sum is σ = 1204637760. Its totient is φ = 321236728.

The previous prime is 642473459. The next prime is 642473471. The reversal of 642473464 is 464374246.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 40154584 + ... + 40154599.

It is an arithmetic number, because the mean of its divisors is an integer number (150579720).

Almost surely, 2^642473464 is an apocalyptic number.

It is an amenable number.

642473464 is a deficient number, since it is larger than the sum of its proper divisors (562164296).

642473464 is a wasteful number, since it uses less digits than its factorization.

642473464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80309189 (or 80309185 counting only the distinct ones).

The product of its digits is 387072, while the sum is 40.

The square root of 642473464 is about 25347.0602634704. The cubic root of 642473464 is about 862.8826398262.

The spelling of 642473464 in words is "six hundred forty-two million, four hundred seventy-three thousand, four hundred sixty-four".