68890305 has 32 divisors (see below), whose sum is σ = 120683520. Its totient is φ = 33279680.

The previous prime is 68890279. The next prime is 68890331. The reversal of 68890305 is 50309886.

It is an interprime number because it is at equal distance from previous prime (68890279) and next prime (68890331).

It is not a de Polignac number, because 68890305 - 2⁸ = 68890049 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58654 + ... + 59816.

It is an arithmetic number, because the mean of its divisors is an integer number (3771360).

Almost surely, 2^68890305 is an apocalyptic number.

It is an amenable number.

68890305 is a deficient number, since it is larger than the sum of its proper divisors (51793215).

68890305 is a wasteful number, since it uses less digits than its factorization.

68890305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 68890305 is about 8300.0183734736. The cubic root of 68890305 is about 409.9391244141.

The spelling of 68890305 in words is "sixty-eight million, eight hundred ninety thousand, three hundred five".