649722305 has 4 divisors (see below), whose sum is σ = 779666772. Its totient is φ = 519777840.

The previous prime is 649722289. The next prime is 649722329. The reversal of 649722305 is 503227946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 288456256 + 361266049 = 16984^2 + 19007^2 .

It is not a de Polignac number, because 649722305 - 2⁴ = 649722289 is a prime.

It is a super-2 number, since 2×649722305² = 844278147229026050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64972226 + ... + 64972235.

It is an arithmetic number, because the mean of its divisors is an integer number (194916693).

Almost surely, 2^649722305 is an apocalyptic number.

It is an amenable number.

649722305 is a deficient number, since it is larger than the sum of its proper divisors (129944467).

649722305 is a wasteful number, since it uses less digits than its factorization.

649722305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129944466.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 649722305 is about 25489.6509391557. The cubic root of 649722305 is about 866.1157286575.

The spelling of 649722305 in words is "six hundred forty-nine million, seven hundred twenty-two thousand, three hundred five".