645627064 has 8 divisors (see below), whose sum is σ = 1210550760. Its totient is φ = 322813528.

The previous prime is 645627013. The next prime is 645627067. The reversal of 645627064 is 460726546.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645627067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40351684 + ... + 40351699.

It is an arithmetic number, because the mean of its divisors is an integer number (151318845).

Almost surely, 2^645627064 is an apocalyptic number.

It is an amenable number.

645627064 is a deficient number, since it is larger than the sum of its proper divisors (564923696).

645627064 is a wasteful number, since it uses less digits than its factorization.

645627064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80703389 (or 80703385 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 40.

The square root of 645627064 is about 25409.1925097985. The cubic root of 645627064 is about 864.2921644241.

The spelling of 645627064 in words is "six hundred forty-five million, six hundred twenty-seven thousand, sixty-four".