647268844428 has 42 divisors (see below), whose sum is σ = 1698303824084. Its totient is φ = 215756280504.

The previous prime is 647268844403. The next prime is 647268844493. The reversal of 647268844428 is 824448862746.

647268844428 is a `hidden beast` number, since 6 + 4 + 72 + 68 + 84 + 4 + 428 = 666.

It is a super-3 number, since 3×647268844428³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 110982826 + ... + 110988657.

Almost surely, 2^647268844428 is an apocalyptic number.

It is an amenable number.

647268844428 is an abundant number, since it is smaller than the sum of its proper divisors (1051034979656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647268844428 is a wasteful number, since it uses less digits than its factorization.

647268844428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221971505 (or 221971488 counting only the distinct ones).

The product of its digits is 132120576, while the sum is 63.

The spelling of 647268844428 in words is "six hundred forty-seven billion, two hundred sixty-eight million, eight hundred forty-four thousand, four hundred twenty-eight".