679681749 has 8 divisors (see below), whose sum is σ = 930735520. Its totient is φ = 440874576.

The previous prime is 679681747. The next prime is 679681753. The reversal of 679681749 is 947186976.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 679681749 - 2¹ = 679681747 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679681741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3061519 + ... + 3061740.

It is an arithmetic number, because the mean of its divisors is an integer number (116341940).

Almost surely, 2^679681749 is an apocalyptic number.

It is an amenable number.

679681749 is a deficient number, since it is larger than the sum of its proper divisors (251053771).

679681749 is a wasteful number, since it uses less digits than its factorization.

679681749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6123299.

The product of its digits is 4572288, while the sum is 57.

The square root of 679681749 is about 26070.7067222966. The cubic root of 679681749 is about 879.2287271969.

The spelling of 679681749 in words is "six hundred seventy-nine million, six hundred eighty-one thousand, seven hundred forty-nine".