645264534 has 16 divisors (see below), whose sum is σ = 1325408688. Its totient is φ = 209274912.

The previous prime is 645264511. The next prime is 645264539. The reversal of 645264534 is 435462546.

It is a junction number, because it is equal to n+sod(n) for n = 645264492 and 645264501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645264539) by changing a digit.

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, 1453077 + ... + 1453520.

It is an arithmetic number, because the mean of its divisors is an integer number (82838043).

Almost surely, 2^645264534 is an apocalyptic number.

645264534 is an abundant number, since it is smaller than the sum of its proper divisors (680144154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645264534 is a wasteful number, since it uses less digits than its factorization.

645264534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2906639.

The product of its digits is 345600, while the sum is 39.

The square root of 645264534 is about 25402.0576725587. The cubic root of 645264534 is about 864.1303628098.

The spelling of 645264534 in words is "six hundred forty-five million, two hundred sixty-four thousand, five hundred thirty-four".