68507820 has 72 divisors (see below), whose sum is σ = 209808144. Its totient is φ = 18092928.

The previous prime is 68507797. The next prime is 68507833. The reversal of 68507820 is 2870586.

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

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 23 ways as a sum of consecutive naturals, for example, 17482 + ... + 21038.

It is an arithmetic number, because the mean of its divisors is an integer number (2914002).

Almost surely, 2^68507820 is an apocalyptic number.

68507820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68507820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104904072).

68507820 is an abundant number, since it is smaller than the sum of its proper divisors (141300324).

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

68507820 is a wasteful number, since it uses less digits than its factorization.

68507820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3679 (or 3674 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 68507820 is about 8276.9450886181. The cubic root of 68507820 is about 409.1790433679.

The spelling of 68507820 in words is "sixty-eight million, five hundred seven thousand, eight hundred twenty".