641440030 has 64 divisors (see below), whose sum is σ = 1473043968. Its totient is φ = 195269760.

The previous prime is 641440027. The next prime is 641440061. The reversal of 641440030 is 30044146.

It is a happy number.

It is a super-2 number, since 2×641440030² = 822890624172801800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 641439983 and 641440010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23424 + ... + 42796.

It is an arithmetic number, because the mean of its divisors is an integer number (23016312).

Almost surely, 2^641440030 is an apocalyptic number.

641440030 is an abundant number, since it is smaller than the sum of its proper divisors (831603938).

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

641440030 is a wasteful number, since it uses less digits than its factorization.

641440030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19441.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 641440030 is about 25326.6663815039. Note that the first 3 decimals coincide. The cubic root of 641440030 is about 862.4197357220.

Adding to 641440030 its reverse (30044146), we get a palindrome (671484176).

The spelling of 641440030 in words is "six hundred forty-one million, four hundred forty thousand, thirty".