643701348 has 18 divisors (see below), whose sum is σ = 1627134054. Its totient is φ = 214567104.

The previous prime is 643701347. The next prime is 643701349. The reversal of 643701348 is 843107346.

643701348 is a `hidden beast` number, since 643 + 7 + 0 + 1 + 3 + 4 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (643701347) and next prime (643701349).

It can be written as a sum of positive squares in only one way, i.e., 625400064 + 18301284 = 25008^2 + 4278^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 17880593 = 643701348 / (6 + 4 + 3 + 7 + 0 + 1 + 3 + 4 + 8).

It is not an unprimeable number, because it can be changed into a prime (643701343) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8940261 + ... + 8940332.

Almost surely, 2^643701348 is an apocalyptic number.

It is an amenable number.

643701348 is an abundant number, since it is smaller than the sum of its proper divisors (983432706).

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

643701348 is a wasteful number, since it uses less digits than its factorization.

643701348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17880603 (or 17880598 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 643701348 is about 25371.2701298142. The cubic root of 643701348 is about 863.4319987149.

The spelling of 643701348 in words is "six hundred forty-three million, seven hundred one thousand, three hundred forty-eight".