685690078 has 8 divisors (see below), whose sum is σ = 1028663640. Its totient is φ = 342802200.

The previous prime is 685690073. The next prime is 685690079. The reversal of 685690078 is 870096586.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685690073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5208 + ... + 37396.

It is an arithmetic number, because the mean of its divisors is an integer number (128582955).

Almost surely, 2^685690078 is an apocalyptic number.

685690078 is a deficient number, since it is larger than the sum of its proper divisors (342973562).

685690078 is a wasteful number, since it uses less digits than its factorization.

685690078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42842.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 685690078 is about 26185.6846005599. The cubic root of 685690078 is about 881.8118995285.

The spelling of 685690078 in words is "six hundred eighty-five million, six hundred ninety thousand, seventy-eight".