55489420 has 24 divisors (see below), whose sum is σ = 133174944. Its totient is φ = 19024896.

The previous prime is 55489403. The next prime is 55489433. The reversal of 55489420 is 2498455.

It is a self number, because there is not a number n which added to its sum of digits gives 55489420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198037 + ... + 198316.

It is an arithmetic number, because the mean of its divisors is an integer number (5548956).

Almost surely, 2^55489420 is an apocalyptic number.

It is an amenable number.

55489420 is an abundant number, since it is smaller than the sum of its proper divisors (77685524).

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

55489420 is a wasteful number, since it uses less digits than its factorization.

55489420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396369 (or 396367 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 55489420 is about 7449.1220959251. The cubic root of 55489420 is about 381.4199414374.

The spelling of 55489420 in words is "fifty-five million, four hundred eighty-nine thousand, four hundred twenty".