68660840 has 16 divisors (see below), whose sum is σ = 154486980. Its totient is φ = 27464320.

The previous prime is 68660797. The next prime is 68660849. The reversal of 68660840 is 4806686.

It can be written as a sum of positive squares in 2 ways, for example, as 68326756 + 334084 = 8266^2 + 578^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68660794 and 68660803.

It is not an unprimeable number, because it can be changed into a prime (68660849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858221 + ... + 858300.

Almost surely, 2^68660840 is an apocalyptic number.

It is an amenable number.

68660840 is an abundant number, since it is smaller than the sum of its proper divisors (85826140).

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

68660840 is a wasteful number, since it uses less digits than its factorization.

68660840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716532 (or 1716528 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 68660840 is about 8286.1836812854. The cubic root of 68660840 is about 409.4834661212.

The spelling of 68660840 in words is "sixty-eight million, six hundred sixty thousand, eight hundred forty".