68945820 has 48 divisors (see below), whose sum is σ = 194775840. Its totient is φ = 18221056.

The previous prime is 68945803. The next prime is 68945827. The reversal of 68945820 is 2854986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68945827) 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 15 ways as a sum of consecutive naturals, for example, 1696 + ... + 11864.

It is an arithmetic number, because the mean of its divisors is an integer number (4057830).

Almost surely, 2^68945820 is an apocalyptic number.

68945820 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 68945820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97387920).

68945820 is an abundant number, since it is smaller than the sum of its proper divisors (125830020).

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

68945820 is a wasteful number, since it uses less digits than its factorization.

68945820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10294 (or 10292 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 68945820 is about 8303.3619697084. The cubic root of 68945820 is about 410.0492108292.

The spelling of 68945820 in words is "sixty-eight million, nine hundred forty-five thousand, eight hundred twenty".