55040789 has 4 divisors (see below), whose sum is σ = 55084524. Its totient is φ = 54997056.

The previous prime is 55040773. The next prime is 55040879. The reversal of 55040789 is 98704055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98704055 = 5 ⋅19740811.

It can be written as a sum of positive squares in 2 ways, for example, as 54982225 + 58564 = 7415^2 + 242^2 .

It is a cyclic number.

It is not a de Polignac number, because 55040789 - 2⁴ = 55040773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55040189) 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, 19922 + ... + 22515.

It is an arithmetic number, because the mean of its divisors is an integer number (13771131).

Almost surely, 2^55040789 is an apocalyptic number.

It is an amenable number.

55040789 is a deficient number, since it is larger than the sum of its proper divisors (43735).

55040789 is a wasteful number, since it uses less digits than its factorization.

55040789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43734.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 55040789 is about 7418.9479712423. The cubic root of 55040789 is about 380.3892341352.

The spelling of 55040789 in words is "fifty-five million, forty thousand, seven hundred eighty-nine".