68531720 has 64 divisors (see below), whose sum is σ = 162241920. Its totient is φ = 26002944.

The previous prime is 68531713. The next prime is 68531737. The reversal of 68531720 is 2713586.

It is a happy number.

It is a super-3 number, since 3×68531720³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149732 + ... + 150188.

It is an arithmetic number, because the mean of its divisors is an integer number (2535030).

Almost surely, 2^68531720 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 68531720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81120960).

68531720 is an abundant number, since it is smaller than the sum of its proper divisors (93710200).

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

68531720 is a wasteful number, since it uses less digits than its factorization.

68531720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 68531720 is about 8278.3887321145. The cubic root of 68531720 is about 409.2266206233.

The spelling of 68531720 in words is "sixty-eight million, five hundred thirty-one thousand, seven hundred twenty".