3646720649340 has 72 divisors (see below), whose sum is σ = 11085714607968. Its totient is φ = 970349362560.

The previous prime is 3646720649333. The next prime is 3646720649389. The reversal of 3646720649340 is 439460276463.

3646720649340 is a `hidden beast` number, since 3 + 6 + 46 + 72 + 0 + 6 + 493 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21890512 + ... + 22056471.

It is an arithmetic number, because the mean of its divisors is an integer number (153968258444).

Almost surely, 2^{3646720649340} is an apocalyptic number.

3646720649340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3646720649340 is an abundant number, since it is smaller than the sum of its proper divisors (7438993958628).

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

3646720649340 is a wasteful number, since it uses less digits than its factorization.

3646720649340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43947459 (or 43947454 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 54.

The spelling of 3646720649340 in words is "three trillion, six hundred forty-six billion, seven hundred twenty million, six hundred forty-nine thousand, three hundred forty".