643682710 has 64 divisors (see below), whose sum is σ = 1313444160. Its totient is φ = 225054720.

The previous prime is 643682707. The next prime is 643682737. The reversal of 643682710 is 17286346.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 643682710.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 361342 + ... + 363118.

It is an arithmetic number, because the mean of its divisors is an integer number (20522565).

Almost surely, 2^643682710 is an apocalyptic number.

643682710 is an abundant number, since it is smaller than the sum of its proper divisors (669761450).

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

643682710 is a wasteful number, since it uses less digits than its factorization.

643682710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 643682710 is about 25370.9028219336. The cubic root of 643682710 is about 863.4236652432.

The spelling of 643682710 in words is "six hundred forty-three million, six hundred eighty-two thousand, seven hundred ten".