649726803840 has 128 divisors (see below), whose sum is σ = 2090360027520. Its totient is φ = 171641169920.

The previous prime is 649726803827. The next prime is 649726803841. The reversal of 649726803840 is 48308627946.

649726803840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649726803841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1375866 + ... + 1786745.

It is an arithmetic number, because the mean of its divisors is an integer number (16330937715).

Almost surely, 2^649726803840 is an apocalyptic number.

649726803840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

649726803840 is an abundant number, since it is smaller than the sum of its proper divisors (1440633223680).

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

649726803840 is a wasteful number, since it uses less digits than its factorization.

649726803840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162740 (or 3162728 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 57.

The spelling of 649726803840 in words is "six hundred forty-nine billion, seven hundred twenty-six million, eight hundred three thousand, eight hundred forty".