643451052 has 24 divisors (see below), whose sum is σ = 1516866736. Its totient is φ = 212272128.

The previous prime is 643451047. The next prime is 643451063. The reversal of 643451052 is 250154346.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275233 + ... + 277560.

Almost surely, 2^643451052 is an apocalyptic number.

It is an amenable number.

643451052 is an abundant number, since it is smaller than the sum of its proper divisors (873415684).

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

643451052 is a wasteful number, since it uses less digits than its factorization.

643451052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552897 (or 552895 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 643451052 is about 25366.3369842790. The cubic root of 643451052 is about 863.3200722792.

The spelling of 643451052 in words is "six hundred forty-three million, four hundred fifty-one thousand, fifty-two".