643616358 has 64 divisors (see below), whose sum is σ = 1656668160. Its totient is φ = 161776800.

The previous prime is 643616357. The next prime is 643616359. The reversal of 643616358 is 853616346.

It is an interprime number because it is at equal distance from previous prime (643616357) and next prime (643616359).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643616357) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8148 + ... + 36791.

It is an arithmetic number, because the mean of its divisors is an integer number (25885440).

Almost surely, 2^643616358 is an apocalyptic number.

643616358 is an abundant number, since it is smaller than the sum of its proper divisors (1013051802).

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

643616358 is a wasteful number, since it uses less digits than its factorization.

643616358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44993.

The product of its digits is 311040, while the sum is 42.

The square root of 643616358 is about 25369.5951485238. The cubic root of 643616358 is about 863.3939964562.

The spelling of 643616358 in words is "six hundred forty-three million, six hundred sixteen thousand, three hundred fifty-eight".