643157712 has 40 divisors (see below), whose sum is σ = 1846102080. Its totient is φ = 214385760.

The previous prime is 643157707. The next prime is 643157747. The reversal of 643157712 is 217751346.

It is a happy number.

643157712 is a `hidden beast` number, since 643 + 1 + 5 + 7 + 7 + 1 + 2 = 666.

643157712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 743964 + ... + 744827.

It is an arithmetic number, because the mean of its divisors is an integer number (46152552).

Almost surely, 2^643157712 is an apocalyptic number.

It is an amenable number.

643157712 is an abundant number, since it is smaller than the sum of its proper divisors (1202944368).

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

643157712 is a wasteful number, since it uses less digits than its factorization.

643157712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488808 (or 1488796 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 643157712 is about 25360.5542526184. The cubic root of 643157712 is about 863.1888606391.

It can be divided in two parts, 64315 and 7712, that added together give a palindrome (72027).

The spelling of 643157712 in words is "six hundred forty-three million, one hundred fifty-seven thousand, seven hundred twelve".