68307540 has 96 divisors (see below), whose sum is σ = 220846080. Its totient is φ = 15451776.

The previous prime is 68307529. The next prime is 68307559. The reversal of 68307540 is 4570386.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42471 + ... + 44049.

It is an arithmetic number, because the mean of its divisors is an integer number (2300480).

Almost surely, 2^68307540 is an apocalyptic number.

68307540 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 68307540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110423040).

68307540 is an abundant number, since it is smaller than the sum of its proper divisors (152538540).

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

68307540 is a wasteful number, since it uses less digits than its factorization.

68307540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701 (or 1699 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 68307540 is about 8264.8375664619. The cubic root of 68307540 is about 408.7799143908.

The spelling of 68307540 in words is "sixty-eight million, three hundred seven thousand, five hundred forty".