645130894 has 8 divisors (see below), whose sum is σ = 998912448. Its totient is φ = 312160080.

The previous prime is 645130891. The next prime is 645130907. The reversal of 645130894 is 498031546.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645130891) 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 3 ways as a sum of consecutive naturals, for example, 5202607 + ... + 5202730.

It is an arithmetic number, because the mean of its divisors is an integer number (124864056).

Almost surely, 2^645130894 is an apocalyptic number.

645130894 is a deficient number, since it is larger than the sum of its proper divisors (353781554).

645130894 is a wasteful number, since it uses less digits than its factorization.

645130894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10405370.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 645130894 is about 25399.4270407818. The cubic root of 645130894 is about 864.0707023403.

The spelling of 645130894 in words is "six hundred forty-five million, one hundred thirty thousand, eight hundred ninety-four".