421617568 has 12 divisors (see below), whose sum is σ = 830059650. Its totient is φ = 210808768.

The previous prime is 421617563. The next prime is 421617587. The reversal of 421617568 is 865716124.

It can be written as a sum of positive squares in only one way, i.e., 296803984 + 124813584 = 17228^2 + 11172^2 .

It is a super-2 number, since 2×421617568² = 355522747292469248, 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 421617568.

It is not an unprimeable number, because it can be changed into a prime (421617563) 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 as a sum of consecutive naturals, namely, 6587743 + ... + 6587806.

Almost surely, 2^421617568 is an apocalyptic number.

It is an amenable number.

421617568 is a deficient number, since it is larger than the sum of its proper divisors (408442082).

421617568 is a wasteful number, since it uses less digits than its factorization.

421617568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13175559 (or 13175551 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 421617568 is about 20533.3282251076. The cubic root of 421617568 is about 749.8474166636.

It can be divided in two parts, 42161 and 7568, that added together give a square (49729 = 223²).

The spelling of 421617568 in words is "four hundred twenty-one million, six hundred seventeen thousand, five hundred sixty-eight".