643425012 has 24 divisors (see below), whose sum is σ = 1668139200. Its totient is φ = 214474968.

The previous prime is 643424989. The next prime is 643425037. The reversal of 643425012 is 210524346.

643425012 is a `hidden beast` number, since 643 + 4 + 2 + 5 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 2978712 + ... + 2978927.

It is an arithmetic number, because the mean of its divisors is an integer number (69505800).

Almost surely, 2^643425012 is an apocalyptic number.

It is an amenable number.

643425012 is an abundant number, since it is smaller than the sum of its proper divisors (1024714188).

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

643425012 is a wasteful number, since it uses less digits than its factorization.

643425012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5957652 (or 5957644 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 643425012 is about 25365.8237004044. The cubic root of 643425012 is about 863.3084261418.

Adding to 643425012 its reverse (210524346), we get a palindrome (853949358).

The spelling of 643425012 in words is "six hundred forty-three million, four hundred twenty-five thousand, twelve".