55442689 has 4 divisors (see below), whose sum is σ = 55469124. Its totient is φ = 55416256.

The previous prime is 55442683. The next prime is 55442731. The reversal of 55442689 is 98624455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32718400 + 22724289 = 5720^2 + 4767^2 .

It is a cyclic number.

It is not a de Polignac number, because 55442689 - 2⁷ = 55442561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55442683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9772 + ... + 14365.

It is an arithmetic number, because the mean of its divisors is an integer number (13867281).

Almost surely, 2^55442689 is an apocalyptic number.

It is an amenable number.

55442689 is a deficient number, since it is larger than the sum of its proper divisors (26435).

55442689 is a wasteful number, since it uses less digits than its factorization.

55442689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26434.

The product of its digits is 345600, while the sum is 43.

The square root of 55442689 is about 7445.9847569009. The cubic root of 55442689 is about 381.3128390911.

The spelling of 55442689 in words is "fifty-five million, four hundred forty-two thousand, six hundred eighty-nine".