645330487 has 4 divisors (see below), whose sum is σ = 645442560. Its totient is φ = 645218416.

The previous prime is 645330479. The next prime is 645330551. The reversal of 645330487 is 784033546.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 645330487 - 2³ = 645330479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645330437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46903 + ... + 59080.

It is an arithmetic number, because the mean of its divisors is an integer number (161360640).

Almost surely, 2^645330487 is an apocalyptic number.

645330487 is a deficient number, since it is larger than the sum of its proper divisors (112073).

645330487 is a wasteful number, since it uses less digits than its factorization.

645330487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112072.

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 645330487 is about 25403.3558216233. The cubic root of 645330487 is about 864.1598029568.

The spelling of 645330487 in words is "six hundred forty-five million, three hundred thirty thousand, four hundred eighty-seven".