641433240 has 96 divisors (see below), whose sum is σ = 2382475680. Its totient is φ = 146612736.

The previous prime is 641433227. The next prime is 641433251. The reversal of 641433240 is 42334146.

641433240 is a `hidden beast` number, since 6 + 414 + 3 + 3 + 240 = 666.

It is a super-2 number, since 2×641433240² = 822873202753795200, which 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 23 ways as a sum of consecutive naturals, for example, 124749 + ... + 129788.

It is an arithmetic number, because the mean of its divisors is an integer number (24817455).

Almost surely, 2^641433240 is an apocalyptic number.

641433240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641433240 is an abundant number, since it is smaller than the sum of its proper divisors (1741042440).

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

641433240 is a wasteful number, since it uses less digits than its factorization.

641433240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254561 (or 254554 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 641433240 is about 25326.5323327138. The cubic root of 641433240 is about 862.4166926469.

Adding to 641433240 its reverse (42334146), we get a palindrome (683767386).

The spelling of 641433240 in words is "six hundred forty-one million, four hundred thirty-three thousand, two hundred forty".