641420520 has 64 divisors (see below), whose sum is σ = 2072286720. Its totient is φ = 157887744.

The previous prime is 641420503. The next prime is 641420531. The reversal of 641420520 is 25024146.

641420520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×641420520² = 822840566954140800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 204024 + ... + 207143.

It is an arithmetic number, because the mean of its divisors is an integer number (32379480).

Almost surely, 2^641420520 is an apocalyptic number.

641420520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

641420520 is an abundant number, since it is smaller than the sum of its proper divisors (1430866200).

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

641420520 is a wasteful number, since it uses less digits than its factorization.

641420520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411194 (or 411190 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 641420520 is about 25326.2812114215. The cubic root of 641420520 is about 862.4109918651.

Adding to 641420520 its reverse (25024146), we get a palindrome (666444666).

The spelling of 641420520 in words is "six hundred forty-one million, four hundred twenty thousand, five hundred twenty".