55128715 has 8 divisors (see below), whose sum is σ = 67276080. Its totient is φ = 43355232.

The previous prime is 55128679. The next prime is 55128721. The reversal of 55128715 is 51782155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55128715 - 2¹¹ = 55126667 is a prime.

It is a super-3 number, since 3×55128715³ (a number of 24 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93144 + ... + 93733.

It is an arithmetic number, because the mean of its divisors is an integer number (8409510).

Almost surely, 2^55128715 is an apocalyptic number.

55128715 is a deficient number, since it is larger than the sum of its proper divisors (12147365).

55128715 is a wasteful number, since it uses less digits than its factorization.

55128715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186941.

The product of its digits is 14000, while the sum is 34.

The square root of 55128715 is about 7424.8713793574. The cubic root of 55128715 is about 380.5916798152.

The spelling of 55128715 in words is "fifty-five million, one hundred twenty-eight thousand, seven hundred fifteen".