646763047 has 8 divisors (see below), whose sum is σ = 739328000. Its totient is φ = 554240664.

The previous prime is 646763041. The next prime is 646763087. The reversal of 646763047 is 740367646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646763047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646762994 and 646763012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646763041) 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, 34954 + ... + 50152.

It is an arithmetic number, because the mean of its divisors is an integer number (92416000).

Almost surely, 2^646763047 is an apocalyptic number.

646763047 is a deficient number, since it is larger than the sum of its proper divisors (92564953).

646763047 is a wasteful number, since it uses less digits than its factorization.

646763047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21285.

The product of its (nonzero) digits is 508032, while the sum is 43.

The square root of 646763047 is about 25431.5364655775. The cubic root of 646763047 is about 864.7987757397.

The spelling of 646763047 in words is "six hundred forty-six million, seven hundred sixty-three thousand, forty-seven".