55578889 has 2 divisors, whose sum is σ = 55578890. Its totient is φ = 55578888.

The previous prime is 55578851. The next prime is 55578893. The reversal of 55578889 is 98887555.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33177600 + 22401289 = 5760^2 + 4733^2 .

It is a cyclic number.

It is not a de Polignac number, because 55578889 - 2¹⁵ = 55546121 is a prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (55578989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27789444 + 27789445.

It is an arithmetic number, because the mean of its divisors is an integer number (27789445).

Almost surely, 2^55578889 is an apocalyptic number.

It is an amenable number.

55578889 is a deficient number, since it is larger than the sum of its proper divisors (1).

55578889 is an equidigital number, since it uses as much as digits as its factorization.

55578889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032000, while the sum is 55.

The square root of 55578889 is about 7455.1250157191. The cubic root of 55578889 is about 381.6248269597.

The spelling of 55578889 in words is "fifty-five million, five hundred seventy-eight thousand, eight hundred eighty-nine".