641012420 has 48 divisors (see below), whose sum is σ = 1427155968. Its totient is φ = 241418880.

The previous prime is 641012413. The next prime is 641012431. The reversal of 641012420 is 24210146.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 641012392 and 641012401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8969 + ... + 36911.

It is an arithmetic number, because the mean of its divisors is an integer number (29732416).

Almost surely, 2^641012420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641012420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (713577984).

641012420 is an abundant number, since it is smaller than the sum of its proper divisors (786143548).

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

641012420 is a wasteful number, since it uses less digits than its factorization.

641012420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28020 (or 28018 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 641012420 is about 25318.2230814092. The cubic root of 641012420 is about 862.2280517692.

Adding to 641012420 its reverse (24210146), we get a palindrome (665222566).

The spelling of 641012420 in words is "six hundred forty-one million, twelve thousand, four hundred twenty".