55400289 has 16 divisors (see below), whose sum is σ = 85292928. Its totient is φ = 31329792.

The previous prime is 55400287. The next prime is 55400311. The reversal of 55400289 is 98200455.

It is not a de Polignac number, because 55400289 - 2¹ = 55400287 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55400287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11562 + ... + 15635.

It is an arithmetic number, because the mean of its divisors is an integer number (5330808).

Almost surely, 2^55400289 is an apocalyptic number.

It is an amenable number.

55400289 is a deficient number, since it is larger than the sum of its proper divisors (29892639).

55400289 is a wasteful number, since it uses less digits than its factorization.

55400289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27304.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 55400289 is about 7443.1370402539. The cubic root of 55400289 is about 381.2156108371.

The spelling of 55400289 in words is "fifty-five million, four hundred thousand, two hundred eighty-nine".