645030939 has 8 divisors (see below), whose sum is σ = 982904320. Its totient is φ = 368589096.

The previous prime is 645030913. The next prime is 645030959. The reversal of 645030939 is 939030546.

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

It is not a de Polignac number, because 645030939 - 2⁹ = 645030427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645030897 and 645030906.

It is not an unprimeable number, because it can be changed into a prime (645030959) 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, 15357859 + ... + 15357900.

It is an arithmetic number, because the mean of its divisors is an integer number (122863040).

Almost surely, 2^645030939 is an apocalyptic number.

645030939 is a deficient number, since it is larger than the sum of its proper divisors (337873381).

645030939 is a wasteful number, since it uses less digits than its factorization.

645030939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30715769.

The product of its (nonzero) digits is 87480, while the sum is 39.

The square root of 645030939 is about 25397.4593020641. The cubic root of 645030939 is about 864.0260743696.

The spelling of 645030939 in words is "six hundred forty-five million, thirty thousand, nine hundred thirty-nine".