68507840 has 28 divisors (see below), whose sum is σ = 163135056. Its totient is φ = 27403008.

The previous prime is 68507833. The next prime is 68507849. The reversal of 68507840 is 4870586.

It is a junction number, because it is equal to n+sod(n) for n = 68507794 and 68507803.

It is not an unprimeable number, because it can be changed into a prime (68507849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106724 + ... + 107363.

It is an arithmetic number, because the mean of its divisors is an integer number (5826252).

Almost surely, 2^68507840 is an apocalyptic number.

It is an amenable number.

68507840 is an abundant number, since it is smaller than the sum of its proper divisors (94627216).

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

68507840 is a wasteful number, since it uses less digits than its factorization.

68507840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214104 (or 214094 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 68507840 is about 8276.9462967933. The cubic root of 68507840 is about 409.1790831862.

The spelling of 68507840 in words is "sixty-eight million, five hundred seven thousand, eight hundred forty".