645406130 has 8 divisors (see below), whose sum is σ = 1161731052. Its totient is φ = 258162448.

The previous prime is 645406129. The next prime is 645406141. The reversal of 645406130 is 31604546.

It is a happy number.

645406130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 603635761 + 41770369 = 24569^2 + 6463^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 645406093 and 645406102.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32270297 + ... + 32270316.

Almost surely, 2^645406130 is an apocalyptic number.

645406130 is a deficient number, since it is larger than the sum of its proper divisors (516324922).

645406130 is a wasteful number, since it uses less digits than its factorization.

645406130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64540620.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 645406130 is about 25404.8446167262. The cubic root of 645406130 is about 864.1935660634.

The spelling of 645406130 in words is "six hundred forty-five million, four hundred six thousand, one hundred thirty".