643241487 has 8 divisors (see below), whose sum is σ = 980177536. Its totient is φ = 367566552.

The previous prime is 643241479. The next prime is 643241503. The reversal of 643241487 is 784142346.

643241487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643241487 - 2³ = 643241479 is a prime.

It is a super-2 number, since 2×643241487² = 827519221195942338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643240487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15315253 + ... + 15315294.

It is an arithmetic number, because the mean of its divisors is an integer number (122522192).

Almost surely, 2^643241487 is an apocalyptic number.

643241487 is a deficient number, since it is larger than the sum of its proper divisors (336936049).

643241487 is a wasteful number, since it uses less digits than its factorization.

643241487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30630557.

The product of its digits is 129024, while the sum is 39.

The square root of 643241487 is about 25362.2058780383. The cubic root of 643241487 is about 863.2263374538.

The spelling of 643241487 in words is "six hundred forty-three million, two hundred forty-one thousand, four hundred eighty-seven".