647821128746 has 48 divisors (see below), whose sum is σ = 1108932056064. Its totient is φ = 283317540000.

The previous prime is 647821128727. The next prime is 647821128751.

647821128746 is nontrivially palindromic in base 10.

647821128746 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 647821128691 and 647821128700.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1048271 + ... + 1547421.

It is an arithmetic number, because the mean of its divisors is an integer number (23102751168).

Almost surely, 2^647821128746 is an apocalyptic number.

647821128746 is a deficient number, since it is larger than the sum of its proper divisors (461110927318).

647821128746 is a wasteful number, since it uses less digits than its factorization.

647821128746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499379 (or 499368 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 56.

The spelling of 647821128746 in words is "six hundred forty-seven billion, eight hundred twenty-one million, one hundred twenty-eight thousand, seven hundred forty-six".