685224135 has 24 divisors (see below), whose sum is σ = 1215346704. Its totient is φ = 356952960.

The previous prime is 685224131. The next prime is 685224149. The reversal of 685224135 is 531422586.

685224135 is a `hidden beast` number, since 68 + 522 + 41 + 35 = 666.

It is not a de Polignac number, because 685224135 - 2² = 685224131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685224135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685224131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175126 + ... + 178995.

It is an arithmetic number, because the mean of its divisors is an integer number (50639446).

Almost surely, 2^685224135 is an apocalyptic number.

685224135 is a deficient number, since it is larger than the sum of its proper divisors (530122569).

685224135 is a wasteful number, since it uses less digits than its factorization.

685224135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354175 (or 354172 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 685224135 is about 26176.7861854736. The cubic root of 685224135 is about 881.6121167615.

The spelling of 685224135 in words is "six hundred eighty-five million, two hundred twenty-four thousand, one hundred thirty-five".