55380780 has 384 divisors, whose sum is σ = 225792000. Its totient is φ = 11176704.

The previous prime is 55380779. The next prime is 55380799. The reversal of 55380780 is 8708355.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2407849 + ... + 2407871.

It is an arithmetic number, because the mean of its divisors is an integer number (588000).

Almost surely, 2^55380780 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 55380780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112896000).

55380780 is an abundant number, since it is smaller than the sum of its proper divisors (170411220).

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

55380780 is a wasteful number, since it uses less digits than its factorization.

55380780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 55380780 is about 7441.8263887301. The cubic root of 55380780 is about 381.1708577101.

The spelling of 55380780 in words is "fifty-five million, three hundred eighty thousand, seven hundred eighty".