55489956 has 48 divisors (see below), whose sum is σ = 137088000. Its totient is φ = 17420832.

The previous prime is 55489949. The next prime is 55489991. The reversal of 55489956 is 65998455.

It is a junction number, because it is equal to n+sod(n) for n = 55489899 and 55489908.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44761 + ... + 45983.

It is an arithmetic number, because the mean of its divisors is an integer number (2856000).

Almost surely, 2^55489956 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 55489956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68544000).

55489956 is an abundant number, since it is smaller than the sum of its proper divisors (81598044).

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

55489956 is a wasteful number, since it uses less digits than its factorization.

55489956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448 (or 1446 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 51.

The square root of 55489956 is about 7449.1580732322. The cubic root of 55489956 is about 381.4211695419.

The spelling of 55489956 in words is "fifty-five million, four hundred eighty-nine thousand, nine hundred fifty-six".