68399287 has 4 divisors (see below), whose sum is σ = 74617416. Its totient is φ = 62181160.

The previous prime is 68399251. The next prime is 68399291. The reversal of 68399287 is 78299386.

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 68399287 - 2⁷ = 68399159 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 (68399207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3109048 + ... + 3109069.

It is an arithmetic number, because the mean of its divisors is an integer number (18654354).

Almost surely, 2^68399287 is an apocalyptic number.

68399287 is a deficient number, since it is larger than the sum of its proper divisors (6218129).

68399287 is a wasteful number, since it uses less digits than its factorization.

68399287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6218128.

The product of its digits is 1306368, while the sum is 52.

The square root of 68399287 is about 8270.3861457613. The cubic root of 68399287 is about 408.9628495498.

Subtracting 68399287 from its reverse (78299386), we obtain a palindrome (9900099).

It can be divided in two parts, 68399 and 287, that added together give a palindrome (68686).

The spelling of 68399287 in words is "sixty-eight million, three hundred ninety-nine thousand, two hundred eighty-seven".