55291680 has 96 divisors (see below), whose sum is σ = 193536000. Its totient is φ = 14743296.

The previous prime is 55291669. The next prime is 55291711. The reversal of 55291680 is 8619255.

It is a happy number.

55291680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2080 + ... + 10719.

It is an arithmetic number, because the mean of its divisors is an integer number (2016000).

Almost surely, 2^55291680 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 55291680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96768000).

55291680 is an abundant number, since it is smaller than the sum of its proper divisors (138244320).

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

55291680 is a wasteful number, since it uses less digits than its factorization.

55291680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12823 (or 12809 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 55291680 is about 7435.8375452937. The cubic root of 55291680 is about 380.9663309574.

The spelling of 55291680 in words is "fifty-five million, two hundred ninety-one thousand, six hundred eighty".