68820287 has 4 divisors (see below), whose sum is σ = 68851440. Its totient is φ = 68789136.

The previous prime is 68820251. The next prime is 68820293. The reversal of 68820287 is 78202886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68820287 - 2¹⁰ = 68819263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68820187) 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, 11987 + ... + 16772.

It is an arithmetic number, because the mean of its divisors is an integer number (17212860).

Almost surely, 2^68820287 is an apocalyptic number.

68820287 is a deficient number, since it is larger than the sum of its proper divisors (31153).

68820287 is a wasteful number, since it uses less digits than its factorization.

68820287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31152.

The product of its (nonzero) digits is 86016, while the sum is 41.

The square root of 68820287 is about 8295.7993587116. The cubic root of 68820287 is about 409.8001941373.

The spelling of 68820287 in words is "sixty-eight million, eight hundred twenty thousand, two hundred eighty-seven".