68400263 has 4 divisors (see below), whose sum is σ = 69690888. Its totient is φ = 67109640.

The previous prime is 68400223. The next prime is 68400271. The reversal of 68400263 is 36200486.

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 68400263 - 2¹⁶ = 68334727 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 (68400223) 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, 645233 + ... + 645338.

It is an arithmetic number, because the mean of its divisors is an integer number (17422722).

Almost surely, 2^68400263 is an apocalyptic number.

68400263 is a deficient number, since it is larger than the sum of its proper divisors (1290625).

68400263 is a wasteful number, since it uses less digits than its factorization.

68400263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290624.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 68400263 is about 8270.4451512600. The cubic root of 68400263 is about 408.9647947252.

The spelling of 68400263 in words is "sixty-eight million, four hundred thousand, two hundred sixty-three".