68697216 has 144 divisors (see below), whose sum is σ = 230147190. Its totient is φ = 19611648.

The previous prime is 68697203. The next prime is 68697229. The reversal of 68697216 is 61279686.

It is an interprime number because it is at equal distance from previous prime (68697203) and next prime (68697229).

It can be written as a sum of positive squares in only one way, i.e., 62346816 + 6350400 = 7896^2 + 2520^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 55840 + ... + 57056.

Almost surely, 2^68697216 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 68697216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115073595).

68697216 is an abundant number, since it is smaller than the sum of its proper divisors (161449974).

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

68697216 is a wasteful number, since it uses less digits than its factorization.

68697216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1251 (or 1229 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 68697216 is about 8288.3783697416. The cubic root of 68697216 is about 409.5557671147. Note that the first 3 decimals are identical.

The spelling of 68697216 in words is "sixty-eight million, six hundred ninety-seven thousand, two hundred sixteen".