216128715 has 32 divisors (see below), whose sum is σ = 377968896. Its totient is φ = 104588160.

The previous prime is 216128713. The next prime is 216128719. The reversal of 216128715 is 517821612.

It is not a de Polignac number, because 216128715 - 2¹ = 216128713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (216128713) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120052 + ... + 121838.

It is an arithmetic number, because the mean of its divisors is an integer number (11811528).

Almost surely, 2^216128715 is an apocalyptic number.

216128715 is a deficient number, since it is larger than the sum of its proper divisors (161840181).

216128715 is a wasteful number, since it uses less digits than its factorization.

216128715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539.

The product of its digits is 6720, while the sum is 33.

The square root of 216128715 is about 14701.3167777584. The cubic root of 216128715 is about 600.1191568900.

It can be divided in two parts, 2161 and 28715, that added together give a triangular number (30876 = T₂₄₈).

The spelling of 216128715 in words is "two hundred sixteen million, one hundred twenty-eight thousand, seven hundred fifteen".