55782318 has 8 divisors (see below), whose sum is σ = 111564648. Its totient is φ = 18594104.

The previous prime is 55782313. The next prime is 55782319. The reversal of 55782318 is 81328755.

It is a sphenic number, since it is the product of 3 distinct primes.

55782318 is an admirable number.

It is a super-2 number, since 2×55782318² = 6223334002906248, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55782313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4648521 + ... + 4648532.

It is an arithmetic number, because the mean of its divisors is an integer number (13945581).

Almost surely, 2^55782318 is an apocalyptic number.

55782318 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

55782318 is a wasteful number, since it uses less digits than its factorization.

55782318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9297058.

The product of its digits is 67200, while the sum is 39.

The square root of 55782318 is about 7468.7561213364. The cubic root of 55782318 is about 382.0898658305.

The spelling of 55782318 in words is "fifty-five million, seven hundred eighty-two thousand, three hundred eighteen".