643287087 has 24 divisors (see below), whose sum is σ = 938293200. Its totient is φ = 424677120.

The previous prime is 643287083. The next prime is 643287091. The reversal of 643287087 is 780782346.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (643287083) and next prime (643287091).

It is not a de Polignac number, because 643287087 - 2² = 643287083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643287083) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 657943 + ... + 658919.

It is an arithmetic number, because the mean of its divisors is an integer number (39095550).

Almost surely, 2^643287087 is an apocalyptic number.

643287087 is a deficient number, since it is larger than the sum of its proper divisors (295006113).

643287087 is a wasteful number, since it uses less digits than its factorization.

643287087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1620 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 643287087 is about 25363.1048375391. The cubic root of 643287087 is about 863.2467352835.

The spelling of 643287087 in words is "six hundred forty-three million, two hundred eighty-seven thousand, eighty-seven".