645494958 has 24 divisors (see below), whose sum is σ = 1443688896. Its totient is φ = 208224000.

The previous prime is 645494929. The next prime is 645494959. The reversal of 645494958 is 859494546.

645494958 is a `hidden beast` number, since 6 + 4 + 549 + 4 + 95 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645494959) 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 11 ways as a sum of consecutive naturals, for example, 577843 + ... + 578958.

It is an arithmetic number, because the mean of its divisors is an integer number (60153704).

Almost surely, 2^645494958 is an apocalyptic number.

645494958 is an abundant number, since it is smaller than the sum of its proper divisors (798193938).

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

645494958 is a wasteful number, since it uses less digits than its factorization.

645494958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156840 (or 1156837 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The square root of 645494958 is about 25406.5928058053. The cubic root of 645494958 is about 864.2332109015.

The spelling of 645494958 in words is "six hundred forty-five million, four hundred ninety-four thousand, nine hundred fifty-eight".