645606130 has 32 divisors (see below), whose sum is σ = 1317355200. Its totient is φ = 225830592.

The previous prime is 645606119. The next prime is 645606139. The reversal of 645606130 is 31606546.

It is a junction number, because it is equal to n+sod(n) for n = 645606092 and 645606101.

It is not an unprimeable number, because it can be changed into a prime (645606139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128220 + ... + 133159.

It is an arithmetic number, because the mean of its divisors is an integer number (41167350).

Almost surely, 2^645606130 is an apocalyptic number.

645606130 is an abundant number, since it is smaller than the sum of its proper divisors (671749070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645606130 is a wasteful number, since it uses less digits than its factorization.

645606130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261418.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 645606130 is about 25408.7805689293. The cubic root of 645606130 is about 864.2828229695.

The spelling of 645606130 in words is "six hundred forty-five million, six hundred six thousand, one hundred thirty".