645287788 has 24 divisors (see below), whose sum is σ = 1142285760. Its totient is φ = 318931200.

The previous prime is 645287777. The next prime is 645287801. The reversal of 645287788 is 887782546.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 406845 + ... + 408427.

It is an arithmetic number, because the mean of its divisors is an integer number (47595240).

Almost surely, 2^645287788 is an apocalyptic number.

It is an amenable number.

645287788 is a deficient number, since it is larger than the sum of its proper divisors (496997972).

645287788 is a wasteful number, since it uses less digits than its factorization.

645287788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2697 (or 2695 counting only the distinct ones).

The product of its digits is 6021120, while the sum is 55.

The square root of 645287788 is about 25402.5153872604. The cubic root of 645287788 is about 864.1407431758.

The spelling of 645287788 in words is "six hundred forty-five million, two hundred eighty-seven thousand, seven hundred eighty-eight".