685016677378428 has 24 divisors (see below), whose sum is σ = 1598661231686400. Its totient is φ = 228297608963760.

The previous prime is 685016677378381. The next prime is 685016677378489. The reversal of 685016677378428 is 824873776610586.

It is a super-2 number, since 2×685016677378428² (a number of 30 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 7 ways as a sum of consecutive naturals, for example, 5160367828 + ... + 5160500571.

It is an arithmetic number, because the mean of its divisors is an integer number (66610884653600).

Almost surely, 2^{685016677378428} is an apocalyptic number.

It is an amenable number.

685016677378428 is an abundant number, since it is smaller than the sum of its proper divisors (913644554307972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685016677378428 is a wasteful number, since it uses less digits than its factorization.

685016677378428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10320873937 (or 10320873935 counting only the distinct ones).

The product of its (nonzero) digits is 4551966720, while the sum is 78.

The spelling of 685016677378428 in words is "six hundred eighty-five trillion, sixteen billion, six hundred seventy-seven million, three hundred seventy-eight thousand, four hundred twenty-eight".