609534640 has 80 divisors (see below), whose sum is σ = 1664955936. Its totient is φ = 204595200.

The previous prime is 609534623. The next prime is 609534647. The reversal of 609534640 is 46435906.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 609534640.

It is not an unprimeable number, because it can be changed into a prime (609534647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15201 + ... + 38080.

Almost surely, 2^609534640 is an apocalyptic number.

It is an amenable number.

609534640 is an abundant number, since it is smaller than the sum of its proper divisors (1055421296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

609534640 is a wasteful number, since it uses less digits than its factorization.

609534640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53318 (or 53312 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 609534640 is about 24688.7553351723. The cubic root of 609534640 is about 847.8768882033.

The spelling of 609534640 in words is "six hundred nine million, five hundred thirty-four thousand, six hundred forty".