68521316 has 18 divisors (see below), whose sum is σ = 124195890. Its totient is φ = 33077632.

The previous prime is 68521309. The next prime is 68521331. The reversal of 68521316 is 61312586.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 17255716 + 51265600 = 4154^2 + 7160^2 .

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 6821 + ... + 13548.

Almost surely, 2^68521316 is an apocalyptic number.

It is an amenable number.

68521316 is a deficient number, since it is larger than the sum of its proper divisors (55674574).

68521316 is a wasteful number, since it uses less digits than its factorization.

68521316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20431 (or 20400 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 68521316 is about 8277.7603251121. The cubic root of 68521316 is about 409.2059109469.

The spelling of 68521316 in words is "sixty-eight million, five hundred twenty-one thousand, three hundred sixteen".