647980266780 has 672 divisors, whose sum is σ = 2559959474688. Its totient is φ = 133781414400.

The previous prime is 647980266749. The next prime is 647980266821. The reversal of 647980266780 is 87662089746.

647980266780 is a `hidden beast` number, since 6 + 479 + 8 + 0 + 26 + 67 + 80 = 666.

647980266780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×647980266780² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 182991810 + ... + 182995350.

It is an arithmetic number, because the mean of its divisors is an integer number (3809463504).

Almost surely, 2^647980266780 is an apocalyptic number.

647980266780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647980266780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1279979737344).

647980266780 is an abundant number, since it is smaller than the sum of its proper divisors (1911979207908).

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

647980266780 is a wasteful number, since it uses less digits than its factorization.

647980266780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749 (or 3732 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 63.

The spelling of 647980266780 in words is "six hundred forty-seven billion, nine hundred eighty million, two hundred sixty-six thousand, seven hundred eighty".