55129870 has 32 divisors (see below), whose sum is σ = 105066720. Its totient is φ = 20791680.

The previous prime is 55129843. The next prime is 55129903. The reversal of 55129870 is 7892155.

55129870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 10260 + ... + 14680.

It is an arithmetic number, because the mean of its divisors is an integer number (3283335).

Almost surely, 2^55129870 is an apocalyptic number.

55129870 is a deficient number, since it is larger than the sum of its proper divisors (49936850).

55129870 is a wasteful number, since it uses less digits than its factorization.

55129870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 55129870 is about 7424.9491580751. The cubic root of 55129870 is about 380.5943377182.

It can be divided in two parts, 551298 and 70, that added together give a cube (551368 = 82³).

The spelling of 55129870 in words is "fifty-five million, one hundred twenty-nine thousand, eight hundred seventy".