642404512 has 12 divisors (see below), whose sum is σ = 1264733946. Its totient is φ = 321202240.

The previous prime is 642404501. The next prime is 642404531. The reversal of 642404512 is 215404246.

It can be written as a sum of positive squares in only one way, i.e., 416323216 + 226081296 = 20404^2 + 15036^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10037539 + ... + 10037602.

Almost surely, 2^642404512 is an apocalyptic number.

It is an amenable number.

642404512 is a deficient number, since it is larger than the sum of its proper divisors (622329434).

642404512 is a wasteful number, since it uses less digits than its factorization.

642404512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20075151 (or 20075143 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 642404512 is about 25345.7000692425. The cubic root of 642404512 is about 862.8517697511.

Adding to 642404512 its reverse (215404246), we get a palindrome (857808758).

The spelling of 642404512 in words is "six hundred forty-two million, four hundred four thousand, five hundred twelve".