662667640 has 16 divisors (see below), whose sum is σ = 1491002280. Its totient is φ = 265067040.

The previous prime is 662667613. The next prime is 662667671. The reversal of 662667640 is 46766266.

It is a super-2 number, since 2×662667640² = 878256802206339200, which contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 8283306 + ... + 8283385.

Almost surely, 2^662667640 is an apocalyptic number.

It is an amenable number.

662667640 is an abundant number, since it is smaller than the sum of its proper divisors (828334640).

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

662667640 is a wasteful number, since it uses less digits than its factorization.

662667640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16566702 (or 16566698 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 43.

The square root of 662667640 is about 25742.3316737237. The cubic root of 662667640 is about 871.8302246418.

The spelling of 662667640 in words is "six hundred sixty-two million, six hundred sixty-seven thousand, six hundred forty".