640102530 has 32 divisors (see below), whose sum is σ = 1626614784. Its totient is φ = 160653056.

The previous prime is 640102517. The next prime is 640102531. The reversal of 640102530 is 35201046.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 640102497 and 640102506.

It is not an unprimeable number, because it can be changed into a prime (640102531) 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, 627042 + ... + 628061.

It is an arithmetic number, because the mean of its divisors is an integer number (50831712).

Almost surely, 2^640102530 is an apocalyptic number.

640102530 is an abundant number, since it is smaller than the sum of its proper divisors (986512254).

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

640102530 is a wasteful number, since it uses less digits than its factorization.

640102530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255130.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 640102530 is about 25300.2476272467. The cubic root of 640102530 is about 861.8198931781.

Adding to 640102530 its reverse (35201046), we get a palindrome (675303576).

The spelling of 640102530 in words is "six hundred forty million, one hundred two thousand, five hundred thirty".