55177980 has 192 divisors, whose sum is σ = 186278400. Its totient is φ = 12026880.

The previous prime is 55177979. The next prime is 55178009. The reversal of 55177980 is 8977155.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 506166 + ... + 506274.

It is an arithmetic number, because the mean of its divisors is an integer number (970200).

Almost surely, 2^55177980 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 55177980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93139200).

55177980 is an abundant number, since it is smaller than the sum of its proper divisors (131100420).

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

55177980 is a wasteful number, since it uses less digits than its factorization.

55177980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 202 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 55177980 is about 7428.1882044009. The cubic root of 55177980 is about 380.7050161935.

The spelling of 55177980 in words is "fifty-five million, one hundred seventy-seven thousand, nine hundred eighty".