68638055 has 4 divisors (see below), whose sum is σ = 82365672. Its totient is φ = 54910440.

The previous prime is 68638007. The next prime is 68638057. The reversal of 68638055 is 55083686.

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

It is not a de Polignac number, because 68638055 - 2¹⁰ = 68637031 is a prime.

It is a super-2 number, since 2×68638055² = 9422365188366050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68638057) 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, 6863801 + ... + 6863810.

It is an arithmetic number, because the mean of its divisors is an integer number (20591418).

Almost surely, 2^68638055 is an apocalyptic number.

68638055 is a deficient number, since it is larger than the sum of its proper divisors (13727617).

68638055 is a wasteful number, since it uses less digits than its factorization.

68638055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13727616.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 68638055 is about 8284.8086881955. The cubic root of 68638055 is about 409.4381656120.

The spelling of 68638055 in words is "sixty-eight million, six hundred thirty-eight thousand, fifty-five".