642550432 has 12 divisors (see below), whose sum is σ = 1265021226. Its totient is φ = 321275200.

The previous prime is 642550409. The next prime is 642550457. The reversal of 642550432 is 234055246.

It can be written as a sum of positive squares in only one way, i.e., 641304976 + 1245456 = 25324^2 + 1116^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642550394 and 642550403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10039819 + ... + 10039882.

Almost surely, 2^642550432 is an apocalyptic number.

It is an amenable number.

642550432 is a deficient number, since it is larger than the sum of its proper divisors (622470794).

642550432 is a wasteful number, since it uses less digits than its factorization.

642550432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20079711 (or 20079703 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 642550432 is about 25348.5785005787. The cubic root of 642550432 is about 862.9170960867.

The spelling of 642550432 in words is "six hundred forty-two million, five hundred fifty thousand, four hundred thirty-two".