645626895 has 8 divisors (see below), whose sum is σ = 1033003056. Its totient is φ = 344334336.

The previous prime is 645626893. The next prime is 645626909. The reversal of 645626895 is 598626546.

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

It is not a de Polignac number, because 645626895 - 2¹ = 645626893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645626893) 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, 21520882 + ... + 21520911.

It is an arithmetic number, because the mean of its divisors is an integer number (129125382).

Almost surely, 2^645626895 is an apocalyptic number.

645626895 is a deficient number, since it is larger than the sum of its proper divisors (387376161).

645626895 is a wasteful number, since it uses less digits than its factorization.

645626895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43041801.

The product of its digits is 3110400, while the sum is 51.

The square root of 645626895 is about 25409.1891842302. The cubic root of 645626895 is about 864.2920890114.

The spelling of 645626895 in words is "six hundred forty-five million, six hundred twenty-six thousand, eight hundred ninety-five".