55520280 has 96 divisors (see below), whose sum is σ = 189961200. Its totient is φ = 14024448.

The previous prime is 55520233. The next prime is 55520281. The reversal of 55520280 is 8202555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55520281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2782 + ... + 10898.

Almost surely, 2^55520280 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 55520280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94980600).

55520280 is an abundant number, since it is smaller than the sum of its proper divisors (134440920).

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

55520280 is a wasteful number, since it uses less digits than its factorization.

55520280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8153 (or 8146 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 55520280 is about 7451.1931930396. The cubic root of 55520280 is about 381.4906362234.

The spelling of 55520280 in words is "fifty-five million, five hundred twenty thousand, two hundred eighty".