643645230 has 16 divisors (see below), whose sum is σ = 1544748624. Its totient is φ = 171638720.

The previous prime is 643645217. The next prime is 643645243. The reversal of 643645230 is 32546346.

It is an interprime number because it is at equal distance from previous prime (643645217) and next prime (643645243).

It is a junction number, because it is equal to n+sod(n) for n = 643645191 and 643645200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10727391 + ... + 10727450.

It is an arithmetic number, because the mean of its divisors is an integer number (96546789).

Almost surely, 2^643645230 is an apocalyptic number.

643645230 is an abundant number, since it is smaller than the sum of its proper divisors (901103394).

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

643645230 is a wasteful number, since it uses less digits than its factorization.

643645230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21454851.

The product of its (nonzero) digits is 51840, while the sum is 33.

The square root of 643645230 is about 25370.1641697487. The cubic root of 643645230 is about 863.4069065998.

The spelling of 643645230 in words is "six hundred forty-three million, six hundred forty-five thousand, two hundred thirty".