68616720 has 100 divisors (see below), whose sum is σ = 238338540. Its totient is φ = 18296064.

The previous prime is 68616719. The next prime is 68616721. The reversal of 68616720 is 2761686.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (68616719) and next prime (68616721).

It can be written as a sum of positive squares in 2 ways, for example, as 16257024 + 52359696 = 4032^2 + 7236^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (68616721) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 1186 + ... + 11774.

Almost surely, 2^68616720 is an apocalyptic number.

68616720 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 68616720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119169270).

68616720 is an abundant number, since it is smaller than the sum of its proper divisors (169721820).

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

68616720 is a wasteful number, since it uses less digits than its factorization.

68616720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10614 (or 10599 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 68616720 is about 8283.5209904967. The cubic root of 68616720 is about 409.3957388635.

The spelling of 68616720 in words is "sixty-eight million, six hundred sixteen thousand, seven hundred twenty".