647877 has 4 divisors (see below), whose sum is σ = 863840. Its totient is φ = 431916.

The previous prime is 647861. The next prime is 647891. The reversal of 647877 is 778746.

It is a happy number.

647877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 647877 - 2⁴ = 647861 is a prime.

It is a D-number.

It is a Duffinian 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 647877.

It is not an unprimeable number, because it can be changed into a prime (647837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107977 + ... + 107982.

It is an arithmetic number, because the mean of its divisors is an integer number (215960).

2⁶⁴⁷⁸⁷⁷ is an apocalyptic number.

It is an amenable number.

647877 is a deficient number, since it is larger than the sum of its proper divisors (215963).

647877 is a wasteful number, since it uses less digits than its factorization.

647877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215962.

The product of its digits is 65856, while the sum is 39.

The square root of 647877 is about 804.9080692849. The cubic root of 647877 is about 86.5294986653.

It can be divided in two parts, 6478 and 77, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 647877 in words is "six hundred forty-seven thousand, eight hundred seventy-seven".