68457720 has 64 divisors (see below), whose sum is σ = 210165120. Its totient is φ = 17829504.

The previous prime is 68457713. The next prime is 68457731. The reversal of 68457720 is 2775486.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1474 + ... + 11793.

It is an arithmetic number, because the mean of its divisors is an integer number (3283830).

Almost surely, 2^68457720 is an apocalyptic number.

68457720 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 68457720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105082560).

68457720 is an abundant number, since it is smaller than the sum of its proper divisors (141707400).

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

68457720 is a wasteful number, since it uses less digits than its factorization.

68457720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13324 (or 13320 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 68457720 is about 8273.9180561569. The cubic root of 68457720 is about 409.0792743717.

The spelling of 68457720 in words is "sixty-eight million, four hundred fifty-seven thousand, seven hundred twenty".