605666640 has 80 divisors (see below), whose sum is σ = 1879933248. Its totient is φ = 161307648.

The previous prime is 605666527. The next prime is 605666651. The reversal of 605666640 is 46666506.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364692 + ... + 366348.

Almost surely, 2^605666640 is an apocalyptic number.

605666640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

605666640 is an abundant number, since it is smaller than the sum of its proper divisors (1274266608).

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

605666640 is a wasteful number, since it uses less digits than its factorization.

605666640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196 (or 3190 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 605666640 is about 24610.2954065976. The cubic root of 605666640 is about 846.0795883297.

The spelling of 605666640 in words is "six hundred five million, six hundred sixty-six thousand, six hundred forty".