647622147872 has 54 divisors (see below), whose sum is σ = 1483243348923. Its totient is φ = 277538692032.

The previous prime is 647622147839. The next prime is 647622147917. The reversal of 647622147872 is 278741226746.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 323811073936 + 323811073936 = 569044^2 + 569044^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=569044.

It is a Harshad number since it is a multiple of its sum of digits (56).

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 8 ways as a sum of consecutive naturals, for example, 31856303 + ... + 31876625.

Almost surely, 2^647622147872 is an apocalyptic number.

It is an amenable number.

647622147872 is an abundant number, since it is smaller than the sum of its proper divisors (835621201051).

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

647622147872 is an frugal number, since it uses more digits than its factorization.

647622147872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40670 (or 20332 counting only the distinct ones).

The product of its digits is 12644352, while the sum is 56.

The spelling of 647622147872 in words is "six hundred forty-seven billion, six hundred twenty-two million, one hundred forty-seven thousand, eight hundred seventy-two".