643125380 has 48 divisors (see below), whose sum is σ = 1403222016. Its totient is φ = 247328640.

The previous prime is 643125377. The next prime is 643125383. The reversal of 643125380 is 83521346.

It is an interprime number because it is at equal distance from previous prime (643125377) and next prime (643125383).

It is a super-2 number, since 2×643125380² = 827220508800288800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643125383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94037 + ... + 100643.

It is an arithmetic number, because the mean of its divisors is an integer number (29233792).

Almost surely, 2^643125380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643125380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (701611008).

643125380 is an abundant number, since it is smaller than the sum of its proper divisors (760096636).

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

643125380 is a wasteful number, since it uses less digits than its factorization.

643125380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804 (or 6802 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 643125380 is about 25359.9167979708. The cubic root of 643125380 is about 863.1743960221.

The spelling of 643125380 in words is "six hundred forty-three million, one hundred twenty-five thousand, three hundred eighty".