685406079 has 6 divisors (see below), whose sum is σ = 990031016. Its totient is φ = 456937380.

The previous prime is 685406077. The next prime is 685406089. The reversal of 685406079 is 970604586.

It is not a de Polignac number, because 685406079 - 2¹ = 685406077 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 (685406077) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38078107 + ... + 38078124.

Almost surely, 2^685406079 is an apocalyptic number.

685406079 is a deficient number, since it is larger than the sum of its proper divisors (304624937).

685406079 is a wasteful number, since it uses less digits than its factorization.

685406079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76156237 (or 76156234 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 685406079 is about 26180.2612477416. The cubic root of 685406079 is about 881.6901398159.

The spelling of 685406079 in words is "six hundred eighty-five million, four hundred six thousand, seventy-nine".