646263249 has 16 divisors (see below), whose sum is σ = 872693760. Its totient is φ = 425370960.

The previous prime is 646263227. The next prime is 646263253. The reversal of 646263249 is 942362646.

It is not a de Polignac number, because 646263249 - 2¹⁷ = 646132177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646263249.

It is not an unprimeable number, because it can be changed into a prime (646263649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76372 + ... + 84410.

It is an arithmetic number, because the mean of its divisors is an integer number (54543360).

Almost surely, 2^646263249 is an apocalyptic number.

It is an amenable number.

646263249 is a deficient number, since it is larger than the sum of its proper divisors (226430511).

646263249 is a wasteful number, since it uses less digits than its factorization.

646263249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8380.

The product of its digits is 373248, while the sum is 42.

The square root of 646263249 is about 25421.7082234849. The cubic root of 646263249 is about 864.5759552983.

The spelling of 646263249 in words is "six hundred forty-six million, two hundred sixty-three thousand, two hundred forty-nine".