641540430 has 24 divisors (see below), whose sum is σ = 1668005352. Its totient is φ = 171077424.

The previous prime is 641540413. The next prime is 641540531. The reversal of 641540430 is 34045146.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 641540394 and 641540403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3564024 + ... + 3564203.

It is an arithmetic number, because the mean of its divisors is an integer number (69500223).

Almost surely, 2^641540430 is an apocalyptic number.

641540430 is an abundant number, since it is smaller than the sum of its proper divisors (1026464922).

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

641540430 is a wasteful number, since it uses less digits than its factorization.

641540430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7128240 (or 7128237 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 641540430 is about 25328.6484045241. The cubic root of 641540430 is about 862.4647294966.

Adding to 641540430 its reverse (34045146), we get a palindrome (675585576).

The spelling of 641540430 in words is "six hundred forty-one million, five hundred forty thousand, four hundred thirty".