678631749 has 4 divisors (see below), whose sum is σ = 904842336. Its totient is φ = 452421164.

The previous prime is 678631727. The next prime is 678631753. The reversal of 678631749 is 947136876.

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 a cyclic number.

It is not a de Polignac number, because 678631749 - 2¹⁹ = 678107461 is a prime.

It is a super-3 number, since 3×678631749³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678631799) 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, 113105289 + ... + 113105294.

It is an arithmetic number, because the mean of its divisors is an integer number (226210584).

Almost surely, 2^678631749 is an apocalyptic number.

It is an amenable number.

678631749 is a deficient number, since it is larger than the sum of its proper divisors (226210587).

678631749 is a wasteful number, since it uses less digits than its factorization.

678631749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226210586.

The product of its digits is 1524096, while the sum is 51.

The square root of 678631749 is about 26050.5613951024. The cubic root of 678631749 is about 878.7757377562.

The spelling of 678631749 in words is "six hundred seventy-eight million, six hundred thirty-one thousand, seven hundred forty-nine".