647974501356 has 192 divisors, whose sum is σ = 1974220881920. Its totient is φ = 160624477440.

The previous prime is 647974501351. The next prime is 647974501379. The reversal of 647974501356 is 653105479746.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a junction number, because it is equal to n+sod(n) for n = 647974501296 and 647974501305.

It is not an unprimeable number, because it can be changed into a prime (647974501351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2512041 + ... + 2757951.

Almost surely, 2^647974501356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647974501356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987110440960).

647974501356 is an abundant number, since it is smaller than the sum of its proper divisors (1326246380564).

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

647974501356 is a wasteful number, since it uses less digits than its factorization.

647974501356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246084 (or 246082 counting only the distinct ones).

The product of its (nonzero) digits is 19051200, while the sum is 57.

The spelling of 647974501356 in words is "six hundred forty-seven billion, nine hundred seventy-four million, five hundred one thousand, three hundred fifty-six".