55178280 has 128 divisors (see below), whose sum is σ = 193680000. Its totient is φ = 13934592.

The previous prime is 55178197. The next prime is 55178281. The reversal of 55178280 is 8287155.

It is a super-3 number, since 3×55178280³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55178281) 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, 19176 + ... + 21864.

It is an arithmetic number, because the mean of its divisors is an integer number (1513125).

Almost surely, 2^55178280 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 55178280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96840000).

55178280 is an abundant number, since it is smaller than the sum of its proper divisors (138501720).

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

55178280 is a wasteful number, since it uses less digits than its factorization.

55178280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2728 (or 2718 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 55178280 is about 7428.2083977228. The cubic root of 55178280 is about 380.7057061505.

The spelling of 55178280 in words is "fifty-five million, one hundred seventy-eight thousand, two hundred eighty".