55331980 has 48 divisors (see below), whose sum is σ = 127620864. Its totient is φ = 19984320.

The previous prime is 55331963. The next prime is 55332031. The reversal of 55331980 is 8913355.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35089 + ... + 36631.

It is an arithmetic number, because the mean of its divisors is an integer number (2658768).

Almost surely, 2^55331980 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 55331980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63810432).

55331980 is an abundant number, since it is smaller than the sum of its proper divisors (72288884).

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

55331980 is a wasteful number, since it uses less digits than its factorization.

55331980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1726 (or 1724 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 55331980 is about 7438.5469011091. The cubic root of 55331980 is about 381.0588657631.

The spelling of 55331980 in words is "fifty-five million, three hundred thirty-one thousand, nine hundred eighty".