641649510 has 24 divisors (see below), whose sum is σ = 1668288960. Its totient is φ = 171106512.

The previous prime is 641649509. The next prime is 641649517. The reversal of 641649510 is 15946146.

641649510 is a `hidden beast` number, since 6 + 4 + 1 + 649 + 5 + 1 + 0 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641649517) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3564630 + ... + 3564809.

It is an arithmetic number, because the mean of its divisors is an integer number (69512040).

Almost surely, 2^641649510 is an apocalyptic number.

641649510 is an abundant number, since it is smaller than the sum of its proper divisors (1026639450).

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

641649510 is a wasteful number, since it uses less digits than its factorization.

641649510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7129452 (or 7129449 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 641649510 is about 25330.8016059500. The cubic root of 641649510 is about 862.5136078508.

The spelling of 641649510 in words is "six hundred forty-one million, six hundred forty-nine thousand, five hundred ten".