647455442 has 4 divisors (see below), whose sum is σ = 971183166. Its totient is φ = 323727720.

The previous prime is 647455433. The next prime is 647455453. The reversal of 647455442 is 244554746.

It is a happy number.

647455442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244554746 = 2 ⋅122277373.

It can be written as a sum of positive squares in only one way, i.e., 511709641 + 135745801 = 22621^2 + 11651^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 647455442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161863859 + ... + 161863862.

Almost surely, 2^647455442 is an apocalyptic number.

647455442 is a deficient number, since it is larger than the sum of its proper divisors (323727724).

647455442 is a wasteful number, since it uses less digits than its factorization.

647455442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323727723.

The product of its digits is 537600, while the sum is 41.

The square root of 647455442 is about 25445.1457453087. The cubic root of 647455442 is about 865.1072703791.

It can be divided in two parts, 6474 and 55442, that added together give a palindrome (61916).

The spelling of 647455442 in words is "six hundred forty-seven million, four hundred fifty-five thousand, four hundred forty-two".