685428189768 has 48 divisors (see below), whose sum is σ = 2121563446080. Its totient is φ = 195836625504.

The previous prime is 685428189767. The next prime is 685428189769. The reversal of 685428189768 is 867981824586.

685428189768 is a `hidden beast` number, since 6 + 8 + 542 + 8 + 1 + 8 + 9 + 76 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (685428189767) and next prime (685428189769).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 685428189696 and 685428189705.

It is not an unprimeable number, because it can be changed into a prime (685428189767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 679987780 + ... + 679988787.

It is an arithmetic number, because the mean of its divisors is an integer number (44199238460).

Almost surely, 2^685428189768 is an apocalyptic number.

It is an amenable number.

685428189768 is an abundant number, since it is smaller than the sum of its proper divisors (1436135256312).

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

685428189768 is a wasteful number, since it uses less digits than its factorization.

685428189768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359976586 (or 1359976579 counting only the distinct ones).

The product of its digits is 371589120, while the sum is 72.

The spelling of 685428189768 in words is "six hundred eighty-five billion, four hundred twenty-eight million, one hundred eighty-nine thousand, seven hundred sixty-eight".