643517232 has 80 divisors (see below), whose sum is σ = 1787266560. Its totient is φ = 198878976.

The previous prime is 643517219. The next prime is 643517267. The reversal of 643517232 is 232715346.

It is a super-2 number, since 2×643517232² = 828228855761883648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643517193 and 643517202.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35358 + ... + 50370.

It is an arithmetic number, because the mean of its divisors is an integer number (22340832).

Almost surely, 2^643517232 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 643517232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (893633280).

643517232 is an abundant number, since it is smaller than the sum of its proper divisors (1143749328).

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

643517232 is a wasteful number, since it uses less digits than its factorization.

643517232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15090 (or 15084 counting only the distinct ones).

The product of its digits is 30240, while the sum is 33.

The square root of 643517232 is about 25367.6414354981. The cubic root of 643517232 is about 863.3496692281.

The spelling of 643517232 in words is "six hundred forty-three million, five hundred seventeen thousand, two hundred thirty-two".