640303532540 has 48 divisors (see below), whose sum is σ = 1536922011072. Its totient is φ = 219504992256.

The previous prime is 640303532527. The next prime is 640303532551. The reversal of 640303532540 is 45235303046.

It is a super-2 number, since 2×640303532540² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 640303532540.

It is a congruent number.

It is an unprimeable number.

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, 843452 + ... + 1411388.

It is an arithmetic number, because the mean of its divisors is an integer number (32019208564).

Almost surely, 2^640303532540 is an apocalyptic number.

It is an amenable number.

640303532540 is an abundant number, since it is smaller than the sum of its proper divisors (896618478532).

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

640303532540 is a wasteful number, since it uses less digits than its factorization.

640303532540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576006 (or 576004 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 35.

Adding to 640303532540 its reverse (45235303046), we get a palindrome (685538835586).

The spelling of 640303532540 in words is "six hundred forty billion, three hundred three million, five hundred thirty-two thousand, five hundred forty".