55128738 has 32 divisors (see below), whose sum is σ = 126403200. Its totient is φ = 15701760.

The previous prime is 55128727. The next prime is 55128751. The reversal of 55128738 is 83782155.

It is a junction number, because it is equal to n+sod(n) for n = 55128696 and 55128705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12778 + ... + 16538.

It is an arithmetic number, because the mean of its divisors is an integer number (3950100).

Almost surely, 2^55128738 is an apocalyptic number.

55128738 is an abundant number, since it is smaller than the sum of its proper divisors (71274462).

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

55128738 is a wasteful number, since it uses less digits than its factorization.

55128738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4122.

The product of its digits is 67200, while the sum is 39.

The square root of 55128738 is about 7424.8729282056. The cubic root of 55128738 is about 380.5917327435.

The spelling of 55128738 in words is "fifty-five million, one hundred twenty-eight thousand, seven hundred thirty-eight".