68520816 has 300 divisors, whose sum is σ = 251437032. Its totient is φ = 17853696.

The previous prime is 68520791. The next prime is 68520817. The reversal of 68520816 is 61802586.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68520817) 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 59 ways as a sum of consecutive naturals, for example, 825511 + ... + 825593.

Almost surely, 2^68520816 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 68520816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125718516).

68520816 is an abundant number, since it is smaller than the sum of its proper divisors (182916216).

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

68520816 is a wasteful number, since it uses less digits than its factorization.

68520816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 108 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 68520816 is about 8277.7301236510. The cubic root of 68520816 is about 409.2049156193.

The spelling of 68520816 in words is "sixty-eight million, five hundred twenty thousand, eight hundred sixteen".