68664520 has 16 divisors (see below), whose sum is σ = 154495260. Its totient is φ = 27465792.

The previous prime is 68664517. The next prime is 68664527. The reversal of 68664520 is 2546686.

It can be written as a sum of positive squares in 2 ways, for example, as 68657796 + 6724 = 8286^2 + 82^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 68664520.

It is not an unprimeable number, because it can be changed into a prime (68664527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 858267 + ... + 858346.

Almost surely, 2^68664520 is an apocalyptic number.

It is an amenable number.

68664520 is an abundant number, since it is smaller than the sum of its proper divisors (85830740).

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

68664520 is a wasteful number, since it uses less digits than its factorization.

68664520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716624 (or 1716620 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 68664520 is about 8286.4057346958. The cubic root of 68664520 is about 409.4907816557.

The spelling of 68664520 in words is "sixty-eight million, six hundred sixty-four thousand, five hundred twenty".