643477532 has 24 divisors (see below), whose sum is σ = 1194319392. Its totient is φ = 302702400.

The previous prime is 643477529. The next prime is 643477559. The reversal of 643477532 is 235774346.

It is a super-2 number, since 2×643477532² = 828126668377622048, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643477532.

It is a congruent number.

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, 51719 + ... + 62942.

It is an arithmetic number, because the mean of its divisors is an integer number (49763308).

Almost surely, 2^643477532 is an apocalyptic number.

It is an amenable number.

643477532 is a deficient number, since it is larger than the sum of its proper divisors (550841860).

643477532 is a wasteful number, since it uses less digits than its factorization.

643477532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114749 (or 114747 counting only the distinct ones).

The product of its digits is 423360, while the sum is 41.

The square root of 643477532 is about 25366.8589305022. The cubic root of 643477532 is about 863.3319148800.

The spelling of 643477532 in words is "six hundred forty-three million, four hundred seventy-seven thousand, five hundred thirty-two".