68666840 has 32 divisors (see below), whose sum is σ = 168546960. Its totient is φ = 24969600.

The previous prime is 68666833. The next prime is 68666849. The reversal of 68666840 is 4866686.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 68666791 and 68666800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68666849) 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 7 ways as a sum of consecutive naturals, for example, 77591 + ... + 78470.

Almost surely, 2^68666840 is an apocalyptic number.

It is an amenable number.

68666840 is an abundant number, since it is smaller than the sum of its proper divisors (99880120).

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

68666840 is a wasteful number, since it uses less digits than its factorization.

68666840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156083 (or 156079 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 68666840 is about 8286.5457218313. The cubic root of 68666840 is about 409.4953934888.

The spelling of 68666840 in words is "sixty-eight million, six hundred sixty-six thousand, eight hundred forty".