68644420 has 72 divisors (see below), whose sum is σ = 163066176. Its totient is φ = 24216192.

The previous prime is 68644409. The next prime is 68644423. The reversal of 68644420 is 2444686.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (68644423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77299 + ... + 78181.

It is an arithmetic number, because the mean of its divisors is an integer number (2264808).

Almost surely, 2^68644420 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 68644420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81533088).

68644420 is an abundant number, since it is smaller than the sum of its proper divisors (94421756).

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

68644420 is a wasteful number, since it uses less digits than its factorization.

68644420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941 (or 926 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 68644420 is about 8285.1928161027. The cubic root of 68644420 is about 409.4508213386.

The spelling of 68644420 in words is "sixty-eight million, six hundred forty-four thousand, four hundred twenty".