864915945 has 16 divisors (see below), whose sum is σ = 1393156800. Its totient is φ = 458191424.

The previous prime is 864915941. The next prime is 864915977. The reversal of 864915945 is 549519468.

It is a cyclic number.

It is not a de Polignac number, because 864915945 - 2² = 864915941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (864915941) 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, 191259 + ... + 195728.

It is an arithmetic number, because the mean of its divisors is an integer number (87072300).

Almost surely, 2^864915945 is an apocalyptic number.

It is an amenable number.

864915945 is a deficient number, since it is larger than the sum of its proper divisors (528240855).

864915945 is a wasteful number, since it uses less digits than its factorization.

864915945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387144.

The product of its digits is 1555200, while the sum is 51.

The square root of 864915945 is about 29409.4533271192. The cubic root of 864915945 is about 952.7770799224. Note that the first 3 decimals are identical.

The spelling of 864915945 in words is "eight hundred sixty-four million, nine hundred fifteen thousand, nine hundred forty-five".