68136540 has 48 divisors (see below), whose sum is σ = 191147040. Its totient is φ = 18135040.

The previous prime is 68136533. The next prime is 68136559. The reversal of 68136540 is 4563186.

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, 52216 + ... + 53504.

It is an arithmetic number, because the mean of its divisors is an integer number (3982230).

Almost surely, 2^68136540 is an apocalyptic number.

68136540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68136540 is an abundant number, since it is smaller than the sum of its proper divisors (123010500).

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

68136540 is a wasteful number, since it uses less digits than its factorization.

68136540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182 (or 2180 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 68136540 is about 8254.4860530502. The cubic root of 68136540 is about 408.4385183233.

The spelling of 68136540 in words is "sixty-eight million, one hundred thirty-six thousand, five hundred forty".