640805427030 has 32 divisors (see below), whose sum is σ = 1538825739264. Its totient is φ = 170782256736.

The previous prime is 640805427007. The next prime is 640805427077. The reversal of 640805427030 is 30724508046.

It is a happy number.

It is a super-2 number, since 2×640805427030² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640805427030.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6146854 + ... + 6250233.

It is an arithmetic number, because the mean of its divisors is an integer number (48088304352).

Almost surely, 2^640805427030 is an apocalyptic number.

640805427030 is an abundant number, since it is smaller than the sum of its proper divisors (898020312234).

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

640805427030 is a wasteful number, since it uses less digits than its factorization.

640805427030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12398820.

The product of its (nonzero) digits is 161280, while the sum is 39.

The spelling of 640805427030 in words is "six hundred forty billion, eight hundred five million, four hundred twenty-seven thousand, thirty".