68408240 has 40 divisors (see below), whose sum is σ = 159885600. Its totient is φ = 27219456.

The previous prime is 68408239. The next prime is 68408243. The reversal of 68408240 is 4280486.

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 = 68408197 and 68408206.

It is not an unprimeable number, because it can be changed into a prime (68408243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13772 + ... + 18068.

It is an arithmetic number, because the mean of its divisors is an integer number (3997140).

Almost surely, 2^68408240 is an apocalyptic number.

It is an amenable number.

68408240 is an abundant number, since it is smaller than the sum of its proper divisors (91477360).

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

68408240 is a wasteful number, since it uses less digits than its factorization.

68408240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4509 (or 4503 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 68408240 is about 8270.9273966104. The cubic root of 68408240 is about 408.9806922535.

The spelling of 68408240 in words is "sixty-eight million, four hundred eight thousand, two hundred forty".