55485870 has 64 divisors (see below), whose sum is σ = 146036736. Its totient is φ = 13380480.

The previous prime is 55485869. The next prime is 55485907. The reversal of 55485870 is 7858455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91107 + ... + 91713.

It is an arithmetic number, because the mean of its divisors is an integer number (2281824).

Almost surely, 2^55485870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55485870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73018368).

55485870 is an abundant number, since it is smaller than the sum of its proper divisors (90550866).

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

55485870 is a wasteful number, since it uses less digits than its factorization.

55485870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905.

The product of its (nonzero) digits is 224000, while the sum is 42.

The square root of 55485870 is about 7448.8838090012. The cubic root of 55485870 is about 381.4118073362.

The spelling of 55485870 in words is "fifty-five million, four hundred eighty-five thousand, eight hundred seventy".