646227747 has 16 divisors (see below), whose sum is σ = 1044408960. Its totient is φ = 391653000.

The previous prime is 646227721. The next prime is 646227761. The reversal of 646227747 is 747722646.

It is not a de Polignac number, because 646227747 - 2⁶ = 646227683 is a prime.

It is a super-2 number, since 2×646227747² = 835220601985392018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646227247) 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, 1087629 + ... + 1088222.

It is an arithmetic number, because the mean of its divisors is an integer number (65275560).

Almost surely, 2^646227747 is an apocalyptic number.

646227747 is a deficient number, since it is larger than the sum of its proper divisors (398181213).

646227747 is a wasteful number, since it uses less digits than its factorization.

646227747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175871 (or 2175865 counting only the distinct ones).

The product of its digits is 790272, while the sum is 45.

The square root of 646227747 is about 25421.0099523996. The cubic root of 646227747 is about 864.5601233920.

The spelling of 646227747 in words is "six hundred forty-six million, two hundred twenty-seven thousand, seven hundred forty-seven".