55905280 has 88 divisors (see below), whose sum is σ = 137067120. Its totient is φ = 21872640.

The previous prime is 55905257. The next prime is 55905287. The reversal of 55905280 is 8250955.

It is not an unprimeable number, because it can be changed into a prime (55905287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312231 + ... + 312409.

Almost surely, 2^55905280 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 55905280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68533560).

55905280 is an abundant number, since it is smaller than the sum of its proper divisors (81161840).

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

55905280 is a wasteful number, since it uses less digits than its factorization.

55905280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 55905280 is about 7476.9833489182. The cubic root of 55905280 is about 382.3704090593.

The spelling of 55905280 in words is "fifty-five million, nine hundred five thousand, two hundred eighty".