55980813 has 32 divisors (see below), whose sum is σ = 90844416. Its totient is φ = 29933568.

The previous prime is 55980811. The next prime is 55980829. The reversal of 55980813 is 31808955.

55980813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55980813 - 2¹ = 55980811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55980811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82845 + ... + 83517.

It is an arithmetic number, because the mean of its divisors is an integer number (2838888).

Almost surely, 2^55980813 is an apocalyptic number.

It is an amenable number.

55980813 is a deficient number, since it is larger than the sum of its proper divisors (34863603).

55980813 is a wasteful number, since it uses less digits than its factorization.

55980813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933.

The product of its (nonzero) digits is 43200, while the sum is 39.

The square root of 55980813 is about 7482.0326783569. The cubic root of 55980813 is about 382.5425370268.

The spelling of 55980813 in words is "fifty-five million, nine hundred eighty thousand, eight hundred thirteen".