215272305 has 12 divisors (see below), whose sum is σ = 373138740. Its totient is φ = 114811872.

The previous prime is 215272303. The next prime is 215272331. The reversal of 215272305 is 503272512.

It can be written as a sum of positive squares in 2 ways, for example, as 164249856 + 51022449 = 12816^2 + 7143^2 .

It is not a de Polignac number, because 215272305 - 2¹ = 215272303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215272301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2391870 + ... + 2391959.

It is an arithmetic number, because the mean of its divisors is an integer number (31094895).

Almost surely, 2^215272305 is an apocalyptic number.

It is an amenable number.

215272305 is a deficient number, since it is larger than the sum of its proper divisors (157866435).

215272305 is a wasteful number, since it uses less digits than its factorization.

215272305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4783840 (or 4783837 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 215272305 is about 14672.1608837962. The cubic root of 215272305 is about 599.3254502553.

It can be divided in two parts, 21527 and 2305, that added together give a palindrome (23832).

The spelling of 215272305 in words is "two hundred fifteen million, two hundred seventy-two thousand, three hundred five".