55318518 has 64 divisors (see below), whose sum is σ = 127008000. Its totient is φ = 17839872.

The previous prime is 55318513. The next prime is 55318531. The reversal of 55318518 is 81581355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55318513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308953 + ... + 309131.

It is an arithmetic number, because the mean of its divisors is an integer number (1984500).

Almost surely, 2^55318518 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55318518, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63504000).

55318518 is an abundant number, since it is smaller than the sum of its proper divisors (71689482).

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

55318518 is a wasteful number, since it uses less digits than its factorization.

55318518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 340 counting only the distinct ones).

The product of its digits is 24000, while the sum is 36.

The square root of 55318518 is about 7437.6419650317. The cubic root of 55318518 is about 381.0279600040.

The spelling of 55318518 in words is "fifty-five million, three hundred eighteen thousand, five hundred eighteen".