55045980 has 120 divisors (see below), whose sum is σ = 188440560. Its totient is φ = 13340160.

The previous prime is 55045979. The next prime is 55046003. The reversal of 55045980 is 8954055.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 16276 + ... + 19364.

It is an arithmetic number, because the mean of its divisors is an integer number (1570338).

Almost surely, 2^55045980 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 55045980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94220280).

55045980 is an abundant number, since it is smaller than the sum of its proper divisors (133394580).

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

55045980 is a wasteful number, since it uses less digits than its factorization.

55045980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3121 (or 3110 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 55045980 is about 7419.2978104400. The cubic root of 55045980 is about 380.4011921666.

The spelling of 55045980 in words is "fifty-five million, forty-five thousand, nine hundred eighty".