68512660 has 24 divisors (see below), whose sum is σ = 144615240. Its totient is φ = 27264384.

The previous prime is 68512603. The next prime is 68512687. The reversal of 68512660 is 6621586.

It can be written as a sum of positive squares in 4 ways, for example, as 29224836 + 39287824 = 5406^2 + 6268^2 .

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, 4755 + ... + 12634.

It is an arithmetic number, because the mean of its divisors is an integer number (6025635).

Almost surely, 2^68512660 is an apocalyptic number.

It is an amenable number.

68512660 is an abundant number, since it is smaller than the sum of its proper divisors (76102580).

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

68512660 is a wasteful number, since it uses less digits than its factorization.

68512660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17595 (or 17593 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 68512660 is about 8277.2374618589. The cubic root of 68512660 is about 409.1886791532.

The spelling of 68512660 in words is "sixty-eight million, five hundred twelve thousand, six hundred sixty".