68515616 has 24 divisors (see below), whose sum is σ = 145267164. Its totient is φ = 31622400.

The previous prime is 68515609. The next prime is 68515619. The reversal of 68515616 is 61651586.

It can be written as a sum of positive squares in 2 ways, for example, as 67305616 + 1210000 = 8204^2 + 1100^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68515616.

It is not an unprimeable number, because it can be changed into a prime (68515619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81935 + ... + 82766.

Almost surely, 2^68515616 is an apocalyptic number.

It is an amenable number.

68515616 is an abundant number, since it is smaller than the sum of its proper divisors (76751548).

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

68515616 is a wasteful number, since it uses less digits than its factorization.

68515616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164724 (or 164716 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 68515616 is about 8277.4160219238. The cubic root of 68515616 is about 409.1945639262.

The spelling of 68515616 in words is "sixty-eight million, five hundred fifteen thousand, six hundred sixteen".