647686746 has 32 divisors (see below), whose sum is σ = 1644919680. Its totient is φ = 185053248.

The previous prime is 647686673. The next prime is 647686747.

It is a happy number.

647686746 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 647686692 and 647686701.

It is not an unprimeable number, because it can be changed into a prime (647686747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 856351 + ... + 857106.

It is an arithmetic number, because the mean of its divisors is an integer number (51403740).

Almost surely, 2^647686746 is an apocalyptic number.

647686746 is an abundant number, since it is smaller than the sum of its proper divisors (997232934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647686746 is a wasteful number, since it uses less digits than its factorization.

647686746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713475 (or 1713469 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 54.

The square root of 647686746 is about 25449.6904892771. The cubic root of 647686746 is about 865.2102782130.

The spelling of 647686746 in words is "six hundred forty-seven million, six hundred eighty-six thousand, seven hundred forty-six".