55731180 has 144 divisors (see below), whose sum is σ = 172053504. Its totient is φ = 13461120.

The previous prime is 55731173. The next prime is 55731187. The reversal of 55731180 is 8113755.

It is an interprime number because it is at equal distance from previous prime (55731173) and next prime (55731187).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55731187) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 671419 + ... + 671501.

It is an arithmetic number, because the mean of its divisors is an integer number (1194816).

Almost surely, 2^55731180 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 55731180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86026752).

55731180 is an abundant number, since it is smaller than the sum of its proper divisors (116322324).

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

55731180 is a wasteful number, since it uses less digits than its factorization.

55731180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 55731180 is about 7465.3318747394. The cubic root of 55731180 is about 381.9730708427.

The spelling of 55731180 in words is "fifty-five million, seven hundred thirty-one thousand, one hundred eighty".