645788093 has 8 divisors (see below), whose sum is σ = 692604000. Its totient is φ = 600254928.

The previous prime is 645788083. The next prime is 645788113. The reversal of 645788093 is 390887546.

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 645788093 - 2⁸ = 645787837 is a prime.

It is a super-2 number, since 2×645788093² = 834084522121153298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645788083) 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, 319643 + ... + 321656.

It is an arithmetic number, because the mean of its divisors is an integer number (86575500).

Almost surely, 2^645788093 is an apocalyptic number.

It is an amenable number.

645788093 is a deficient number, since it is larger than the sum of its proper divisors (46815907).

645788093 is a wasteful number, since it uses less digits than its factorization.

645788093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641371.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 645788093 is about 25412.3610276574. The cubic root of 645788093 is about 864.3640142279.

The spelling of 645788093 in words is "six hundred forty-five million, seven hundred eighty-eight thousand, ninety-three".