647876 has 6 divisors (see below), whose sum is σ = 1133790. Its totient is φ = 323936.

The previous prime is 647861. The next prime is 647891. The reversal of 647876 is 678746.

It is an interprime number because it is at equal distance from previous prime (647861) and next prime (647891).

It can be written as a sum of positive squares in only one way, i.e., 454276 + 193600 = 674^2 + 440^2 .

It is a super-2 number, since 2×647876² = 839486622752, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647876.

It is an unprimeable number.

647876 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 as a sum of consecutive naturals, namely, 80981 + ... + 80988.

It is an arithmetic number, because the mean of its divisors is an integer number (188965).

2⁶⁴⁷⁸⁷⁶ is an apocalyptic number.

It is an amenable number.

647876 is a deficient number, since it is larger than the sum of its proper divisors (485914).

647876 is a wasteful number, since it uses less digits than its factorization.

647876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161973 (or 161971 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 647876 is about 804.9074480957. The cubic root of 647876 is about 86.5294541457.

The spelling of 647876 in words is "six hundred forty-seven thousand, eight hundred seventy-six".