55518388 has 12 divisors (see below), whose sum is σ = 97225380. Its totient is φ = 27739712.

The previous prime is 55518373. The next prime is 55518409. The reversal of 55518388 is 88381555.

55518388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30338064 + 25180324 = 5508^2 + 5018^2 .

It is a super-2 number, since 2×55518388² = 6164582812237088, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 2928 + ... + 10936.

It is an arithmetic number, because the mean of its divisors is an integer number (8102115).

Almost surely, 2^55518388 is an apocalyptic number.

It is an amenable number.

55518388 is a deficient number, since it is larger than the sum of its proper divisors (41706992).

55518388 is a wasteful number, since it uses less digits than its factorization.

55518388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9746 (or 9744 counting only the distinct ones).

The product of its digits is 192000, while the sum is 43.

The square root of 55518388 is about 7451.0662324261. The cubic root of 55518388 is about 381.4863027409.

The spelling of 55518388 in words is "fifty-five million, five hundred eighteen thousand, three hundred eighty-eight".