640255014420 has 192 divisors, whose sum is σ = 2143403458560. Its totient is φ = 139620552192.

The previous prime is 640255014379. The next prime is 640255014433. The reversal of 640255014420 is 24410552046.

It is a super-3 number, since 3×640255014420³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3672549 + ... + 3842931.

It is an arithmetic number, because the mean of its divisors is an integer number (11163559680).

Almost surely, 2^640255014420 is an apocalyptic number.

640255014420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640255014420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1071701729280).

640255014420 is an abundant number, since it is smaller than the sum of its proper divisors (1503148444140).

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

640255014420 is a wasteful number, since it uses less digits than its factorization.

640255014420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170814 (or 170812 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 640255014420 its reverse (24410552046), we get a palindrome (664665566466).

The spelling of 640255014420 in words is "six hundred forty billion, two hundred fifty-five million, fourteen thousand, four hundred twenty".