645030947 has 8 divisors (see below), whose sum is σ = 703899072. Its totient is φ = 586201000.

The previous prime is 645030913. The next prime is 645030959. The reversal of 645030947 is 749030546.

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

It is not a de Polignac number, because 645030947 - 2¹⁰ = 645029923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645030947.

It is not an unprimeable number, because it can be changed into a prime (645000947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34748 + ... + 49974.

It is an arithmetic number, because the mean of its divisors is an integer number (87987384).

Almost surely, 2^645030947 is an apocalyptic number.

645030947 is a deficient number, since it is larger than the sum of its proper divisors (58868125).

645030947 is a wasteful number, since it uses less digits than its factorization.

645030947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19089.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 645030947 is about 25397.4594595601. The cubic root of 645030947 is about 864.0260779416.

The spelling of 645030947 in words is "six hundred forty-five million, thirty thousand, nine hundred forty-seven".