642884584 has 8 divisors (see below), whose sum is σ = 1205408610. Its totient is φ = 321442288.

The previous prime is 642884573. The next prime is 642884587. The reversal of 642884584 is 485488246.

It can be written as a sum of positive squares in only one way, i.e., 627502500 + 15382084 = 25050^2 + 3922^2 .

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

It is not an unprimeable number, because it can be changed into a prime (642884587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40180279 + ... + 40180294.

Almost surely, 2^642884584 is an apocalyptic number.

It is an amenable number.

642884584 is a deficient number, since it is larger than the sum of its proper divisors (562524026).

642884584 is a wasteful number, since it uses less digits than its factorization.

642884584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80360579 (or 80360575 counting only the distinct ones).

The product of its digits is 1966080, while the sum is 49.

The square root of 642884584 is about 25355.1687827157. The cubic root of 642884584 is about 863.0666539994.

The spelling of 642884584 in words is "six hundred forty-two million, eight hundred eighty-four thousand, five hundred eighty-four".