209928768215 has 8 divisors (see below), whose sum is σ = 256667626368. Its totient is φ = 164774278240.

The previous prime is 209928768209. The next prime is 209928768221. The reversal of 209928768215 is 512867829902.

It is an interprime number because it is at equal distance from previous prime (209928768209) and next prime (209928768221).

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

It is not a de Polignac number, because 209928768215 - 2²⁴ = 209911990999 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 396091751 + ... + 396092280.

It is an arithmetic number, because the mean of its divisors is an integer number (32083453296).

Almost surely, 2^209928768215 is an apocalyptic number.

209928768215 is a deficient number, since it is larger than the sum of its proper divisors (46738858153).

209928768215 is an equidigital number, since it uses as much as digits as its factorization.

209928768215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792184089.

The product of its (nonzero) digits is 8709120, while the sum is 59.

The spelling of 209928768215 in words is "two hundred nine billion, nine hundred twenty-eight million, seven hundred sixty-eight thousand, two hundred fifteen".