647790651 has 6 divisors (see below), whose sum is σ = 935697620. Its totient is φ = 431860428.

The previous prime is 647790643. The next prime is 647790673. The reversal of 647790651 is 156097746.

It is a happy number.

It is not a de Polignac number, because 647790651 - 2³ = 647790643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647790597 and 647790606.

It is not an unprimeable number, because it can be changed into a prime (647750651) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 35988361 + ... + 35988378.

Almost surely, 2^647790651 is an apocalyptic number.

647790651 is a deficient number, since it is larger than the sum of its proper divisors (287906969).

647790651 is a wasteful number, since it uses less digits than its factorization.

647790651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71976745 (or 71976742 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 647790651 is about 25451.7317878371. The cubic root of 647790651 is about 865.2565427936.

The spelling of 647790651 in words is "six hundred forty-seven million, seven hundred ninety thousand, six hundred fifty-one".