647299385239920 has 320 divisors, whose sum is σ = 2367475735855104. Its totient is φ = 143168764769280.

The previous prime is 647299385239907. The next prime is 647299385239931. The reversal of 647299385239920 is 29932583992746.

647299385239920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 594365809 + ... + 595453871.

Almost surely, 2^{647299385239920} is an apocalyptic number.

647299385239920 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 647299385239920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1183737867927552).

647299385239920 is an abundant number, since it is smaller than the sum of its proper divisors (1720176350615184).

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

647299385239920 is a wasteful number, since it uses less digits than its factorization.

647299385239920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099540 (or 1099534 counting only the distinct ones).

The product of its (nonzero) digits is 3174474240, while the sum is 78.

The spelling of 647299385239920 in words is "six hundred forty-seven trillion, two hundred ninety-nine billion, three hundred eighty-five million, two hundred thirty-nine thousand, nine hundred twenty".