645324771 has 32 divisors (see below), whose sum is σ = 1074830848. Its totient is φ = 335301120.

The previous prime is 645324703. The next prime is 645324787. The reversal of 645324771 is 177423546.

It is not a de Polignac number, because 645324771 - 2⁹ = 645324259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (645326771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 651 + ... + 35931.

It is an arithmetic number, because the mean of its divisors is an integer number (33588464).

Almost surely, 2^645324771 is an apocalyptic number.

645324771 is a deficient number, since it is larger than the sum of its proper divisors (429506077).

645324771 is a wasteful number, since it uses less digits than its factorization.

645324771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35371.

The product of its digits is 141120, while the sum is 39.

The square root of 645324771 is about 25403.2433165531. The cubic root of 645324771 is about 864.1572515240.

The spelling of 645324771 in words is "six hundred forty-five million, three hundred twenty-four thousand, seven hundred seventy-one".