645088389 has 12 divisors (see below), whose sum is σ = 945419328. Its totient is φ = 390962440.

The previous prime is 645088369. The next prime is 645088391. The reversal of 645088389 is 983880546.

It is not a de Polignac number, because 645088389 - 2⁵ = 645088357 is a prime.

It is a super-2 number, since 2×645088389² = 832278059245230642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645088349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 888189 + ... + 888914.

It is an arithmetic number, because the mean of its divisors is an integer number (78784944).

Almost surely, 2^645088389 is an apocalyptic number.

It is an amenable number.

645088389 is a deficient number, since it is larger than the sum of its proper divisors (300330939).

645088389 is a wasteful number, since it uses less digits than its factorization.

645088389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777128 (or 1777117 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The square root of 645088389 is about 25398.5902955262. The cubic root of 645088389 is about 864.0517252448.

The spelling of 645088389 in words is "six hundred forty-five million, eighty-eight thousand, three hundred eighty-nine".