55047840 has 96 divisors (see below), whose sum is σ = 175887936. Its totient is φ = 14469120.

The previous prime is 55047827. The next prime is 55047851. The reversal of 55047840 is 4874055.

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

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, 34255 + ... + 35825.

It is an arithmetic number, because the mean of its divisors is an integer number (1832166).

Almost surely, 2^55047840 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 55047840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87943968).

55047840 is an abundant number, since it is smaller than the sum of its proper divisors (120840096).

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

55047840 is a wasteful number, since it uses less digits than its factorization.

55047840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 55047840 is about 7419.4231581707. The cubic root of 55047840 is about 380.4054766953.

The spelling of 55047840 in words is "fifty-five million, forty-seven thousand, eight hundred forty".