641987465 has 24 divisors (see below), whose sum is σ = 904131720. Its totient is φ = 436305408.

The previous prime is 641987459. The next prime is 641987483. The reversal of 641987465 is 564789146.

641987465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 226576 + 641760889 = 476^2 + 25333^2 .

It is not a de Polignac number, because 641987465 - 2¹⁴ = 641971081 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16091 + ... + 39279.

It is an arithmetic number, because the mean of its divisors is an integer number (37672155).

Almost surely, 2^641987465 is an apocalyptic number.

It is an amenable number.

641987465 is a deficient number, since it is larger than the sum of its proper divisors (262144255).

641987465 is a wasteful number, since it uses less digits than its factorization.

641987465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23321 (or 23314 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 50.

The square root of 641987465 is about 25337.4715589382. The cubic root of 641987465 is about 862.6650091070.

The spelling of 641987465 in words is "six hundred forty-one million, nine hundred eighty-seven thousand, four hundred sixty-five".