68507540 has 48 divisors (see below), whose sum is σ = 152644800. Its totient is φ = 25754112.

The previous prime is 68507539. The next prime is 68507561. The reversal of 68507540 is 4570586.

It is a self number, because there is not a number n which added to its sum of digits gives 68507540.

It is a congruent number.

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, 52172 + ... + 53468.

It is an arithmetic number, because the mean of its divisors is an integer number (3180100).

Almost surely, 2^68507540 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 68507540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76322400).

68507540 is an abundant number, since it is smaller than the sum of its proper divisors (84137260).

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

68507540 is a wasteful number, since it uses less digits than its factorization.

68507540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464 (or 1462 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 35.

The square root of 68507540 is about 8276.9281741477. The cubic root of 68507540 is about 409.1784859119.

The spelling of 68507540 in words is "sixty-eight million, five hundred seven thousand, five hundred forty".