646752349 has 4 divisors (see below), whose sum is σ = 667615360. Its totient is φ = 625889340.

The previous prime is 646752331. The next prime is 646752373. The reversal of 646752349 is 943257646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646752349 - 2⁷ = 646752221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646752299 and 646752308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646752319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10431459 + ... + 10431520.

It is an arithmetic number, because the mean of its divisors is an integer number (166903840).

Almost surely, 2^646752349 is an apocalyptic number.

It is an amenable number.

646752349 is a deficient number, since it is larger than the sum of its proper divisors (20863011).

646752349 is a wasteful number, since it uses less digits than its factorization.

646752349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20863010.

The product of its digits is 1088640, while the sum is 46.

The square root of 646752349 is about 25431.3261353001. The cubic root of 646752349 is about 864.7940075492.

The spelling of 646752349 in words is "six hundred forty-six million, seven hundred fifty-two thousand, three hundred forty-nine".