55687889 has 2 divisors, whose sum is σ = 55687890. Its totient is φ = 55687888.

The previous prime is 55687871. The next prime is 55687909. The reversal of 55687889 is 98878655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35796289 + 19891600 = 5983^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 55687889 - 2²⁰ = 54639313 is a prime.

It is a super-2 number, since 2×55687889² = 6202281962552642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55681889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27843944 + 27843945.

It is an arithmetic number, because the mean of its divisors is an integer number (27843945).

Almost surely, 2^55687889 is an apocalyptic number.

It is an amenable number.

55687889 is a deficient number, since it is larger than the sum of its proper divisors (1).

55687889 is an equidigital number, since it uses as much as digits as its factorization.

55687889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 56.

The square root of 55687889 is about 7462.4318422348. The cubic root of 55687889 is about 381.8741419028.

The spelling of 55687889 in words is "fifty-five million, six hundred eighty-seven thousand, eight hundred eighty-nine".