640432030854 has 128 divisors (see below), whose sum is σ = 1637965900800. Its totient is φ = 165482956800.

The previous prime is 640432030813. The next prime is 640432030883. The reversal of 640432030854 is 458030234046.

It is a super-2 number, since 2×640432030854² (a number of 24 digits) contains 22 as substring.

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 63 ways as a sum of consecutive naturals, for example, 4295844 + ... + 4442424.

It is an arithmetic number, because the mean of its divisors is an integer number (12796608600).

Almost surely, 2^640432030854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640432030854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818982950400).

640432030854 is an abundant number, since it is smaller than the sum of its proper divisors (997533869946).

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

640432030854 is a wasteful number, since it uses less digits than its factorization.

640432030854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146811 (or 146797 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 39.

The spelling of 640432030854 in words is "six hundred forty billion, four hundred thirty-two million, thirty thousand, eight hundred fifty-four".