643577692 has 12 divisors (see below), whose sum is σ = 1128244320. Its totient is φ = 321222176.

The previous prime is 643577677. The next prime is 643577699. The reversal of 643577692 is 296775346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643577699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139108 + ... + 143659.

It is an arithmetic number, because the mean of its divisors is an integer number (94020360).

Almost surely, 2^643577692 is an apocalyptic number.

It is an amenable number.

643577692 is a deficient number, since it is larger than the sum of its proper divisors (484666628).

643577692 is a wasteful number, since it uses less digits than its factorization.

643577692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283340 (or 283338 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 49.

The square root of 643577692 is about 25368.8330831357. The cubic root of 643577692 is about 863.3767063110.

The spelling of 643577692 in words is "six hundred forty-three million, five hundred seventy-seven thousand, six hundred ninety-two".