685403258 has 4 divisors (see below), whose sum is σ = 1028104890. Its totient is φ = 342701628.

The previous prime is 685403249. The next prime is 685403317. The reversal of 685403258 is 852304586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 369523729 + 315879529 = 19223^2 + 17773^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171350813 + ... + 171350816.

Almost surely, 2^685403258 is an apocalyptic number.

685403258 is a deficient number, since it is larger than the sum of its proper divisors (342701632).

685403258 is a wasteful number, since it uses less digits than its factorization.

685403258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342701631.

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 685403258 is about 26180.2073712184. The cubic root of 685403258 is about 881.6889301917.

The spelling of 685403258 in words is "six hundred eighty-five million, four hundred three thousand, two hundred fifty-eight".