685240635 has 32 divisors (see below), whose sum is σ = 1105827840. Its totient is φ = 362331648.

The previous prime is 685240631. The next prime is 685240649. The reversal of 685240635 is 536042586.

It is not a de Polignac number, because 685240635 - 2² = 685240631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 685240593 and 685240602.

It is not an unprimeable number, because it can be changed into a prime (685240631) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1430326 + ... + 1430804.

It is an arithmetic number, because the mean of its divisors is an integer number (34557120).

Almost surely, 2^685240635 is an apocalyptic number.

685240635 is a deficient number, since it is larger than the sum of its proper divisors (420587205).

685240635 is a wasteful number, since it uses less digits than its factorization.

685240635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107.

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 685240635 is about 26177.1013483159. The cubic root of 685240635 is about 881.6191930267.

It can be divided in two parts, 68 and 5240635, that added together give a triangular number (5240703 = T₃₂₃₇).

The spelling of 685240635 in words is "six hundred eighty-five million, two hundred forty thousand, six hundred thirty-five".