68621655 has 8 divisors (see below), whose sum is σ = 109794672. Its totient is φ = 36598208.

The previous prime is 68621647. The next prime is 68621671. The reversal of 68621655 is 55612686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68621655 - 2³ = 68621647 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2287374 + ... + 2287403.

It is an arithmetic number, because the mean of its divisors is an integer number (13724334).

Almost surely, 2^68621655 is an apocalyptic number.

68621655 is a deficient number, since it is larger than the sum of its proper divisors (41173017).

68621655 is a wasteful number, since it uses less digits than its factorization.

68621655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4574785.

The product of its digits is 86400, while the sum is 39.

The square root of 68621655 is about 8283.8188657165. The cubic root of 68621655 is about 409.4055533788.

The spelling of 68621655 in words is "sixty-eight million, six hundred twenty-one thousand, six hundred fifty-five".