647870 has 32 divisors (see below), whose sum is σ = 1280448. Its totient is φ = 235008.

The previous prime is 647861. The next prime is 647891. The reversal of 647870 is 78746.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647870.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6239 + ... + 6341.

It is an arithmetic number, because the mean of its divisors is an integer number (40014).

2⁶⁴⁷⁸⁷⁰ is an apocalyptic number.

647870 is a deficient number, since it is larger than the sum of its proper divisors (632578).

647870 is a wasteful number, since it uses less digits than its factorization.

647870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 647870 is about 804.9037209505. The cubic root of 647870 is about 86.5291870276.

The spelling of 647870 in words is "six hundred forty-seven thousand, eight hundred seventy".