68616660 has 72 divisors (see below), whose sum is σ = 223503840. Its totient is φ = 15683136.

The previous prime is 68616589. The next prime is 68616679. The reversal of 68616660 is 6661686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8730 + ... + 14609.

It is an arithmetic number, because the mean of its divisors is an integer number (3104220).

Almost surely, 2^68616660 is an apocalyptic number.

68616660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68616660 is an abundant number, since it is smaller than the sum of its proper divisors (154887180).

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

68616660 is a wasteful number, since it uses less digits than its factorization.

68616660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23365 (or 23356 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 68616660 is about 8283.5173688476. The cubic root of 68616660 is about 409.3956195352.

The spelling of 68616660 in words is "sixty-eight million, six hundred sixteen thousand, six hundred sixty".