685207506790 has 64 divisors (see below), whose sum is σ = 1303197590016. Its totient is φ = 258869901312.

The previous prime is 685207506787. The next prime is 685207506811. The reversal of 685207506790 is 97605702586.

It is a super-2 number, since 2×685207506790² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40328677 + ... + 40345663.

It is an arithmetic number, because the mean of its divisors is an integer number (20362462344).

Almost surely, 2^685207506790 is an apocalyptic number.

685207506790 is a deficient number, since it is larger than the sum of its proper divisors (617990083226).

685207506790 is a wasteful number, since it uses less digits than its factorization.

685207506790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19213.

The product of its (nonzero) digits is 6350400, while the sum is 55.

The spelling of 685207506790 in words is "six hundred eighty-five billion, two hundred seven million, five hundred six thousand, seven hundred ninety".