646747646 has 8 divisors (see below), whose sum is σ = 970273080. Its totient is φ = 323323288.

The previous prime is 646747639. The next prime is 646747663.

646747646 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 646747594 and 646747603.

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, 6476 + ... + 36543.

It is an arithmetic number, because the mean of its divisors is an integer number (121284135).

Almost surely, 2^646747646 is an apocalyptic number.

646747646 is a deficient number, since it is larger than the sum of its proper divisors (323525434).

646747646 is a wasteful number, since it uses less digits than its factorization.

646747646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50538.

The product of its digits is 4064256, while the sum is 50.

The square root of 646747646 is about 25431.2336704298. The cubic root of 646747646 is about 864.7919113650.

The spelling of 646747646 in words is "six hundred forty-six million, seven hundred forty-seven thousand, six hundred forty-six".