68690555 has 4 divisors (see below), whose sum is σ = 82428672. Its totient is φ = 54952440.

The previous prime is 68690549. The next prime is 68690593. The reversal of 68690555 is 55509686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55509686 = 2 ⋅27754843.

It is not a de Polignac number, because 68690555 - 2¹⁸ = 68428411 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6869051 + ... + 6869060.

It is an arithmetic number, because the mean of its divisors is an integer number (20607168).

Almost surely, 2^68690555 is an apocalyptic number.

68690555 is a deficient number, since it is larger than the sum of its proper divisors (13738117).

68690555 is a wasteful number, since it uses less digits than its factorization.

68690555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13738116.

The product of its (nonzero) digits is 324000, while the sum is 44.

The square root of 68690555 is about 8287.9765323027. The cubic root of 68690555 is about 409.5425296101.

The spelling of 68690555 in words is "sixty-eight million, six hundred ninety thousand, five hundred fifty-five".