55178320 has 40 divisors (see below), whose sum is σ = 129578760. Its totient is φ = 21849600.

The previous prime is 55178287. The next prime is 55178323. The reversal of 55178320 is 2387155.

It can be written as a sum of positive squares in 4 ways, for example, as 19465744 + 35712576 = 4412^2 + 5976^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55178323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4666 + ... + 11494.

It is an arithmetic number, because the mean of its divisors is an integer number (3239469).

Almost surely, 2^55178320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55178320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64789380).

55178320 is an abundant number, since it is smaller than the sum of its proper divisors (74400440).

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

55178320 is a wasteful number, since it uses less digits than its factorization.

55178320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6943 (or 6937 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55178320 is about 7428.2110901616. The cubic root of 55178320 is about 380.7057981446.

The spelling of 55178320 in words is "fifty-five million, one hundred seventy-eight thousand, three hundred twenty".