55990689 has 4 divisors (see below), whose sum is σ = 74654256. Its totient is φ = 37327124.

The previous prime is 55990679. The next prime is 55990691. The reversal of 55990689 is 98609955.

55990689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55990689 - 2¹⁶ = 55925153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55990609) 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, 9331779 + ... + 9331784.

It is an arithmetic number, because the mean of its divisors is an integer number (18663564).

Almost surely, 2^55990689 is an apocalyptic number.

It is an amenable number.

55990689 is a deficient number, since it is larger than the sum of its proper divisors (18663567).

55990689 is a wasteful number, since it uses less digits than its factorization.

55990689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18663566.

The product of its (nonzero) digits is 874800, while the sum is 51.

The square root of 55990689 is about 7482.6926303303. The cubic root of 55990689 is about 382.5650314480.

The spelling of 55990689 in words is "fifty-five million, nine hundred ninety thousand, six hundred eighty-nine".