643157376 has 32 divisors (see below), whose sum is σ = 1708387800. Its totient is φ = 214385664.

The previous prime is 643157371. The next prime is 643157377. The reversal of 643157376 is 673751346.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643157371) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 837061 + ... + 837828.

Almost surely, 2^643157376 is an apocalyptic number.

It is an amenable number.

643157376 is an abundant number, since it is smaller than the sum of its proper divisors (1065230424).

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

643157376 is a wasteful number, since it uses less digits than its factorization.

643157376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674906 (or 1674894 counting only the distinct ones).

The product of its digits is 317520, while the sum is 42.

The square root of 643157376 is about 25360.5476281566. The cubic root of 643157376 is about 863.1887103227.

The spelling of 643157376 in words is "six hundred forty-three million, one hundred fifty-seven thousand, three hundred seventy-six".