216927515 has 16 divisors (see below), whose sum is σ = 304758720. Its totient is φ = 145121280.

The previous prime is 216927509. The next prime is 216927517. The reversal of 216927515 is 515729612.

It is a happy number.

It is not a de Polignac number, because 216927515 - 2⁴ = 216927499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216927517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74150 + ... + 77019.

It is an arithmetic number, because the mean of its divisors is an integer number (19047420).

Almost surely, 2^216927515 is an apocalyptic number.

216927515 is a deficient number, since it is larger than the sum of its proper divisors (87831205).

216927515 is a wasteful number, since it uses less digits than its factorization.

216927515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151222.

The product of its digits is 37800, while the sum is 38.

The square root of 216927515 is about 14728.4593559544. The cubic root of 216927515 is about 600.8575838511.

The spelling of 216927515 in words is "two hundred sixteen million, nine hundred twenty-seven thousand, five hundred fifteen".