55280688 has 80 divisors (see below), whose sum is σ = 149323776. Its totient is φ = 17602560.

The previous prime is 55280683. The next prime is 55280689. The reversal of 55280688 is 88608255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55280683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144145 + ... + 144527.

Almost surely, 2^55280688 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 55280688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74661888).

55280688 is an abundant number, since it is smaller than the sum of its proper divisors (94043088).

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

55280688 is a wasteful number, since it uses less digits than its factorization.

55280688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 42.

The square root of 55280688 is about 7435.0983853612. The cubic root of 55280688 is about 380.9410838832.

The spelling of 55280688 in words is "fifty-five million, two hundred eighty thousand, six hundred eighty-eight".