55287239 has 12 divisors (see below), whose sum is σ = 67111344. Its totient is φ = 45327744.

The previous prime is 55287227. The next prime is 55287251. The reversal of 55287239 is 93278255.

It is an interprime number because it is at equal distance from previous prime (55287227) and next prime (55287251).

It is a de Polignac number, because none of the positive numbers 2^k-55287239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55287196 and 55287205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55287259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23402 + ... + 25655.

It is an arithmetic number, because the mean of its divisors is an integer number (5592612).

Almost surely, 2^55287239 is an apocalyptic number.

55287239 is a deficient number, since it is larger than the sum of its proper divisors (11824105).

55287239 is a wasteful number, since it uses less digits than its factorization.

55287239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49094 (or 49087 counting only the distinct ones).

The product of its digits is 151200, while the sum is 41.

The square root of 55287239 is about 7435.5389179265. The cubic root of 55287239 is about 380.9561310095.

The spelling of 55287239 in words is "fifty-five million, two hundred eighty-seven thousand, two hundred thirty-nine".