68908509 has 32 divisors (see below), whose sum is σ = 104711040. Its totient is φ = 44775936.

The previous prime is 68908501. The next prime is 68908523. The reversal of 68908509 is 90580986.

It is not a de Polignac number, because 68908509 - 2³ = 68908501 is a prime.

It is a super-2 number, since 2×68908509² = 9496765225206162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68908501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217219 + ... + 217535.

It is an arithmetic number, because the mean of its divisors is an integer number (3272220).

Almost surely, 2^68908509 is an apocalyptic number.

It is an amenable number.

68908509 is a deficient number, since it is larger than the sum of its proper divisors (35802531).

68908509 is a wasteful number, since it uses less digits than its factorization.

68908509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 68908509 is about 8301.1149251170. The cubic root of 68908509 is about 409.9752295168.

The spelling of 68908509 in words is "sixty-eight million, nine hundred eight thousand, five hundred nine".