55987239 has 64 divisors (see below), whose sum is σ = 100776960. Its totient is φ = 26757120.

The previous prime is 55987237. The next prime is 55987241. The reversal of 55987239 is 93278955.

It is a happy number.

55987239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55987237) and next prime (55987241).

It is not a de Polignac number, because 55987239 - 2¹ = 55987237 is a prime.

Its product of digits (680400) is a multiple of the sum of its prime divisors (360).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55987237) 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 63 ways as a sum of consecutive naturals, for example, 207997 + ... + 208265.

It is an arithmetic number, because the mean of its divisors is an integer number (1574640).

Almost surely, 2^55987239 is an apocalyptic number.

55987239 is a deficient number, since it is larger than the sum of its proper divisors (44789721).

55987239 is a wasteful number, since it uses less digits than its factorization.

55987239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360.

The product of its digits is 680400, while the sum is 48.

The square root of 55987239 is about 7482.4620947921. The cubic root of 55987239 is about 382.5571737339.

The spelling of 55987239 in words is "fifty-five million, nine hundred eighty-seven thousand, two hundred thirty-nine".