645442510 has 32 divisors (see below), whose sum is σ = 1173242880. Its totient is φ = 255646368.

The previous prime is 645442481. The next prime is 645442517. The reversal of 645442510 is 15244546.

It is a happy number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645442517) 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 15 ways as a sum of consecutive naturals, for example, 584619 + ... + 585721.

It is an arithmetic number, because the mean of its divisors is an integer number (36663840).

Almost surely, 2^645442510 is an apocalyptic number.

645442510 is a deficient number, since it is larger than the sum of its proper divisors (527800370).

645442510 is a wasteful number, since it uses less digits than its factorization.

645442510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 645442510 is about 25405.5606118031. The cubic root of 645442510 is about 864.2098032665.

The spelling of 645442510 in words is "six hundred forty-five million, four hundred forty-two thousand, five hundred ten".