646743624340 has 48 divisors (see below), whose sum is σ = 1517768207424. Its totient is φ = 229443411200.

The previous prime is 646743624311. The next prime is 646743624343. The reversal of 646743624340 is 43426347646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646743624343) 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, 35841514 + ... + 35859553.

It is an arithmetic number, because the mean of its divisors is an integer number (31620170988).

Almost surely, 2^646743624340 is an apocalyptic number.

It is an amenable number.

646743624340 is an abundant number, since it is smaller than the sum of its proper divisors (871024583084).

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

646743624340 is a wasteful number, since it uses less digits than its factorization.

646743624340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71701128 (or 71701126 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 49.

The spelling of 646743624340 in words is "six hundred forty-six billion, seven hundred forty-three million, six hundred twenty-four thousand, three hundred forty".