679739749 has 8 divisors (see below), whose sum is σ = 732504920. Its totient is φ = 627042816.

The previous prime is 679739741. The next prime is 679739761. The reversal of 679739749 is 947937976.

It can be written as a sum of positive squares in 4 ways, for example, as 275327649 + 404412100 = 16593^2 + 20110^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 679739749 - 2³ = 679739741 is a prime.

It is a super-2 number, since 2×679739749² = 924092252741166002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679739741) 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, 4669 + ... + 37165.

It is an arithmetic number, because the mean of its divisors is an integer number (91563115).

Almost surely, 2^679739749 is an apocalyptic number.

It is an amenable number.

679739749 is a deficient number, since it is larger than the sum of its proper divisors (52765171).

679739749 is a wasteful number, since it uses less digits than its factorization.

679739749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34119.

The product of its digits is 18003384, while the sum is 61.

The square root of 679739749 is about 26071.8190581325. The cubic root of 679739749 is about 879.2537358698.

The spelling of 679739749 in words is "six hundred seventy-nine million, seven hundred thirty-nine thousand, seven hundred forty-nine".