68913040 has 40 divisors (see below), whose sum is σ = 183113280. Its totient is φ = 23627136.

The previous prime is 68913023. The next prime is 68913041. The reversal of 68913040 is 4031986.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 68912993 and 68913011.

It is not an unprimeable number, because it can be changed into a prime (68913041) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 60970 + ... + 62089.

It is an arithmetic number, because the mean of its divisors is an integer number (4577832).

Almost surely, 2^68913040 is an apocalyptic number.

It is an amenable number.

68913040 is an abundant number, since it is smaller than the sum of its proper divisors (114200240).

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

68913040 is a wasteful number, since it uses less digits than its factorization.

68913040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123079 (or 123073 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 68913040 is about 8301.3878357778. The cubic root of 68913040 is about 409.9842151369.

The spelling of 68913040 in words is "sixty-eight million, nine hundred thirteen thousand, forty".