55981240 has 32 divisors (see below), whose sum is σ = 143952480. Its totient is φ = 19193472.

The previous prime is 55981229. The next prime is 55981253. The reversal of 55981240 is 4218955.

55981240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 55981196 and 55981205.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 99687 + ... + 100246.

It is an arithmetic number, because the mean of its divisors is an integer number (4498515).

Almost surely, 2^55981240 is an apocalyptic number.

It is an amenable number.

55981240 is an abundant number, since it is smaller than the sum of its proper divisors (87971240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55981240 is a wasteful number, since it uses less digits than its factorization.

55981240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199951 (or 199947 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 55981240 is about 7482.0612133289. The cubic root of 55981240 is about 382.5435096532.

The spelling of 55981240 in words is "fifty-five million, nine hundred eighty-one thousand, two hundred forty".