641147920 has 40 divisors (see below), whose sum is σ = 1703623104. Its totient is φ = 219821952.

The previous prime is 641147917. The next prime is 641147933. The reversal of 641147920 is 29741146.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×641147920² = 822141310640652800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 571894 + ... + 573013.

Almost surely, 2^641147920 is an apocalyptic number.

It is an amenable number.

641147920 is an abundant number, since it is smaller than the sum of its proper divisors (1062475184).

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

641147920 is a wasteful number, since it uses less digits than its factorization.

641147920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144927 (or 1144921 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 641147920 is about 25320.8988781994. The cubic root of 641147920 is about 862.2888013305.

The spelling of 641147920 in words is "six hundred forty-one million, one hundred forty-seven thousand, nine hundred twenty".