647698 has 8 divisors (see below), whose sum is σ = 987660. Its totient is φ = 318480.

The previous prime is 647693. The next prime is 647719. The reversal of 647698 is 896746.

It can be written as a sum of positive squares in 2 ways, for example, as 400689 + 247009 = 633^2 + 497^2 .

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

It is a d-powerful number, because it can be written as 6⁵ + 4⁸ + 6⁵ + 7⁴ + 9⁶ + 8⁵ .

It is a self number, because there is not a number n which added to its sum of digits gives 647698.

It is not an unprimeable number, because it can be changed into a prime (647693) by changing a digit.

647698 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2533 + ... + 2776.

2⁶⁴⁷⁶⁹⁸ is an apocalyptic number.

647698 is a deficient number, since it is larger than the sum of its proper divisors (339962).

647698 is a wasteful number, since it uses less digits than its factorization.

647698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5372.

The product of its digits is 72576, while the sum is 40.

The square root of 647698 is about 804.7968687812. The cubic root of 647698 is about 86.5215289391.

The spelling of 647698 in words is "six hundred forty-seven thousand, six hundred ninety-eight".