55332780 has 96 divisors (see below), whose sum is σ = 161215488. Its totient is φ = 14169600.

The previous prime is 55332743. The next prime is 55332811. The reversal of 55332780 is 8723355.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204045 + ... + 204315.

It is an arithmetic number, because the mean of its divisors is an integer number (1679328).

Almost surely, 2^55332780 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 55332780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80607744).

55332780 is an abundant number, since it is smaller than the sum of its proper divisors (105882708).

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

55332780 is a wasteful number, since it uses less digits than its factorization.

55332780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 55332780 is about 7438.6006748581. The cubic root of 55332780 is about 381.0607022274.

It can be divided in two parts, 553 and 32780, that added together give a palindrome (33333).

The spelling of 55332780 in words is "fifty-five million, three hundred thirty-two thousand, seven hundred eighty".