68211720 has 160 divisors (see below), whose sum is σ = 235877400. Its totient is φ = 17667072.

The previous prime is 68211719. The next prime is 68211739. The reversal of 68211720 is 2711286.

It can be written as a sum of positive squares in 4 ways, for example, as 56881764 + 11329956 = 7542^2 + 3366^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 119596 + ... + 120164.

Almost surely, 2^68211720 is an apocalyptic number.

68211720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68211720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117938700).

68211720 is an abundant number, since it is smaller than the sum of its proper divisors (167665680).

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

68211720 is a wasteful number, since it uses less digits than its factorization.

68211720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 68211720 is about 8259.0386849802. The cubic root of 68211720 is about 408.5886830817.

The spelling of 68211720 in words is "sixty-eight million, two hundred eleven thousand, seven hundred twenty".