215006765 has 4 divisors (see below), whose sum is σ = 258008124. Its totient is φ = 172005408.

The previous prime is 215006719. The next prime is 215006773. The reversal of 215006765 is 567600512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134258569 + 80748196 = 11587^2 + 8986^2 .

It is a cyclic number.

It is not a de Polignac number, because 215006765 - 2²⁶ = 147897901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21500672 + ... + 21500681.

It is an arithmetic number, because the mean of its divisors is an integer number (64502031).

Almost surely, 2^215006765 is an apocalyptic number.

It is an amenable number.

215006765 is a deficient number, since it is larger than the sum of its proper divisors (43001359).

215006765 is an equidigital number, since it uses as much as digits as its factorization.

215006765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43001358.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 215006765 is about 14663.1089813859. The cubic root of 215006765 is about 599.0789247204.

The spelling of 215006765 in words is "two hundred fifteen million, six thousand, seven hundred sixty-five".