685659506 has 32 divisors (see below), whose sum is σ = 1215017472. Its totient is φ = 284057280.

The previous prime is 685659497. The next prime is 685659511. The reversal of 685659506 is 605956586.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77111 + ... + 85541.

It is an arithmetic number, because the mean of its divisors is an integer number (37969296).

Almost surely, 2^685659506 is an apocalyptic number.

685659506 is a deficient number, since it is larger than the sum of its proper divisors (529357966).

685659506 is a wasteful number, since it uses less digits than its factorization.

685659506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8634.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The square root of 685659506 is about 26185.1008399815. The cubic root of 685659506 is about 881.7987939215.

The spelling of 685659506 in words is "six hundred eighty-five million, six hundred fifty-nine thousand, five hundred six".