6678731 has 4 divisors (see below), whose sum is σ = 6695952. Its totient is φ = 6661512.

The previous prime is 6678713. The next prime is 6678743. The reversal of 6678731 is 1378766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1378766 = 2 ⋅689383.

It is a cyclic number.

It is not a de Polignac number, because 6678731 - 2⁶ = 6678667 is a prime.

It is a super-2 number, since 2×6678731² = 89210895540722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6678701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8015 + ... + 8808.

It is an arithmetic number, because the mean of its divisors is an integer number (1673988).

Almost surely, 2^6678731 is an apocalyptic number.

6678731 is a deficient number, since it is larger than the sum of its proper divisors (17221).

6678731 is a wasteful number, since it uses less digits than its factorization.

6678731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17220.

The product of its digits is 42336, while the sum is 38.

The square root of 6678731 is about 2584.3240895832. The cubic root of 6678731 is about 188.3206670853.

The spelling of 6678731 in words is "six million, six hundred seventy-eight thousand, seven hundred thirty-one".