645744115 has 8 divisors (see below), whose sum is σ = 792913968. Its totient is φ = 504581280.

The previous prime is 645744061. The next prime is 645744119. The reversal of 645744115 is 511447546.

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

It is not a de Polignac number, because 645744115 - 2¹¹ = 645742067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645744119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1501516 + ... + 1501945.

It is an arithmetic number, because the mean of its divisors is an integer number (99114246).

Almost surely, 2^645744115 is an apocalyptic number.

645744115 is a deficient number, since it is larger than the sum of its proper divisors (147169853).

645744115 is a wasteful number, since it uses less digits than its factorization.

645744115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3003509.

The product of its digits is 67200, while the sum is 37.

The square root of 645744115 is about 25411.4957253602. The cubic root of 645744115 is about 864.3443927949.

The spelling of 645744115 in words is "six hundred forty-five million, seven hundred forty-four thousand, one hundred fifteen".