640102529 has 16 divisors (see below), whose sum is σ = 724248000. Its totient is φ = 560387520.

The previous prime is 640102517. The next prime is 640102531. The reversal of 640102529 is 925201046.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-640102529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640104529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131267 + ... + 136055.

It is an arithmetic number, because the mean of its divisors is an integer number (45265500).

Almost surely, 2^640102529 is an apocalyptic number.

It is an amenable number.

640102529 is a deficient number, since it is larger than the sum of its proper divisors (84145471).

640102529 is a wasteful number, since it uses less digits than its factorization.

640102529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5248.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 640102529 is about 25300.2476074840. The cubic root of 640102529 is about 861.8198927293.

The spelling of 640102529 in words is "six hundred forty million, one hundred two thousand, five hundred twenty-nine".