215745745 has 8 divisors (see below), whose sum is σ = 264403584. Its totient is φ = 168924144.

The previous prime is 215745707. The next prime is 215745767. The reversal of 215745745 is 547547512.

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

It is a cyclic number.

It is not a de Polignac number, because 215745745 - 2²¹ = 213648593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215745698 and 215745707.

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, 458799 + ... + 459268.

It is an arithmetic number, because the mean of its divisors is an integer number (33050448).

Almost surely, 2^215745745 is an apocalyptic number.

It is an amenable number.

215745745 is a deficient number, since it is larger than the sum of its proper divisors (48657839).

215745745 is an equidigital number, since it uses as much as digits as its factorization.

215745745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918119.

The product of its digits is 196000, while the sum is 40.

The square root of 215745745 is about 14688.2859789698. The cubic root of 215745745 is about 599.7644862713.

The spelling of 215745745 in words is "two hundred fifteen million, seven hundred forty-five thousand, seven hundred forty-five".