647992685 has 8 divisors (see below), whose sum is σ = 811399680. Its totient is φ = 495855184.

The previous prime is 647992661. The next prime is 647992687. The reversal of 647992685 is 586299746.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647992685 - 2¹⁰ = 647991661 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 647992685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647992687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2817245 + ... + 2817474.

It is an arithmetic number, because the mean of its divisors is an integer number (101424960).

Almost surely, 2^647992685 is an apocalyptic number.

It is an amenable number.

647992685 is a deficient number, since it is larger than the sum of its proper divisors (163406995).

647992685 is a wasteful number, since it uses less digits than its factorization.

647992685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5634747.

The product of its digits is 6531840, while the sum is 56.

The square root of 647992685 is about 25455.7004421407. The cubic root of 647992685 is about 865.3464859822.

The spelling of 647992685 in words is "six hundred forty-seven million, nine hundred ninety-two thousand, six hundred eighty-five".