685079979 has 16 divisors (see below), whose sum is σ = 962071680. Its totient is φ = 432432000.

The previous prime is 685079977. The next prime is 685079981. The reversal of 685079979 is 979970586.

It is an interprime number because it is at equal distance from previous prime (685079977) and next prime (685079981).

It is not a de Polignac number, because 685079979 - 2¹ = 685079977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685079971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183459 + ... + 187155.

It is an arithmetic number, because the mean of its divisors is an integer number (60129480).

Almost surely, 2^685079979 is an apocalyptic number.

685079979 is a deficient number, since it is larger than the sum of its proper divisors (276991701).

685079979 is a wasteful number, since it uses less digits than its factorization.

685079979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6970.

The product of its (nonzero) digits is 8573040, while the sum is 60.

The square root of 685079979 is about 26174.0325322637. The cubic root of 685079979 is about 881.5502885298.

The spelling of 685079979 in words is "six hundred eighty-five million, seventy-nine thousand, nine hundred seventy-nine".