678271731 has 4 divisors (see below), whose sum is σ = 904362312. Its totient is φ = 452181152.

The previous prime is 678271697. The next prime is 678271739. The reversal of 678271731 is 137172876.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 678271731 - 2⁶ = 678271667 is a prime.

It is a super-2 number, since 2×678271731² = 920105082147472722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (678271739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113045286 + ... + 113045291.

It is an arithmetic number, because the mean of its divisors is an integer number (226090578).

Almost surely, 2^678271731 is an apocalyptic number.

678271731 is a deficient number, since it is larger than the sum of its proper divisors (226090581).

678271731 is a wasteful number, since it uses less digits than its factorization.

678271731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226090580.

The product of its digits is 98784, while the sum is 42.

The square root of 678271731 is about 26043.6504929705. The cubic root of 678271731 is about 878.6203117604.

The spelling of 678271731 in words is "six hundred seventy-eight million, two hundred seventy-one thousand, seven hundred thirty-one".