647975 has 6 divisors (see below), whose sum is σ = 803520. Its totient is φ = 518360.

The previous prime is 647963. The next prime is 647987. The reversal of 647975 is 579746.

It is an interprime number because it is at equal distance from previous prime (647963) and next prime (647987).

It is not a de Polignac number, because 647975 - 2⁸ = 647719 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12935 + ... + 12984.

It is an arithmetic number, because the mean of its divisors is an integer number (133920).

2⁶⁴⁷⁹⁷⁵ is an apocalyptic number.

647975 is a deficient number, since it is larger than the sum of its proper divisors (155545).

647975 is a wasteful number, since it uses less digits than its factorization.

647975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25929 (or 25924 counting only the distinct ones).

The product of its digits is 52920, while the sum is 38.

The square root of 647975 is about 804.9689435003. The cubic root of 647975 is about 86.5338613572.

The spelling of 647975 in words is "six hundred forty-seven thousand, nine hundred seventy-five".