68632509 has 16 divisors (see below), whose sum is σ = 101715264. Its totient is φ = 40809600.

The previous prime is 68632507. The next prime is 68632523. The reversal of 68632509 is 90523686.

It is not a de Polignac number, because 68632509 - 2¹ = 68632507 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68632507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17872 + ... + 21369.

It is an arithmetic number, because the mean of its divisors is an integer number (6357204).

Almost surely, 2^68632509 is an apocalyptic number.

It is an amenable number.

68632509 is a deficient number, since it is larger than the sum of its proper divisors (33082755).

68632509 is a wasteful number, since it uses less digits than its factorization.

68632509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39308.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 68632509 is about 8284.4739724378. The cubic root of 68632509 is about 409.4271376906.

The spelling of 68632509 in words is "sixty-eight million, six hundred thirty-two thousand, five hundred nine".