68644660 has 48 divisors (see below), whose sum is σ = 168779520. Its totient is φ = 22959360.

The previous prime is 68644621. The next prime is 68644661. The reversal of 68644660 is 6644686.

68644660 = T₄₇₆ + T₄₇₇ + ... + T₈₀₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68644661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240 + ... + 11719.

It is an arithmetic number, because the mean of its divisors is an integer number (3516240).

Almost surely, 2^68644660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68644660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84389760).

68644660 is an abundant number, since it is smaller than the sum of its proper divisors (100134860).

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

68644660 is a wasteful number, since it uses less digits than its factorization.

68644660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12016 (or 12014 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 40.

The square root of 68644660 is about 8285.2072997602. The cubic root of 68644660 is about 409.4512985228.

The spelling of 68644660 in words is "sixty-eight million, six hundred forty-four thousand, six hundred sixty".