645604293 has 8 divisors (see below), whose sum is σ = 890488800. Its totient is φ = 415561328.

The previous prime is 645604283. The next prime is 645604307. The reversal of 645604293 is 392406546.

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

It is a cyclic number.

It is not a de Polignac number, because 645604293 - 2⁵ = 645604261 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645604283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3710283 + ... + 3710456.

It is an arithmetic number, because the mean of its divisors is an integer number (111311100).

Almost surely, 2^645604293 is an apocalyptic number.

It is an amenable number.

645604293 is a deficient number, since it is larger than the sum of its proper divisors (244884507).

645604293 is a wasteful number, since it uses less digits than its factorization.

645604293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7420771.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 645604293 is about 25408.7444199827. The cubic root of 645604293 is about 864.2820032287.

The spelling of 645604293 in words is "six hundred forty-five million, six hundred four thousand, two hundred ninety-three".