646966929 has 16 divisors (see below), whose sum is σ = 1037742080. Its totient is φ = 350237520.

The previous prime is 646966927. The next prime is 646966937. The reversal of 646966929 is 929669646.

It is not a de Polignac number, because 646966929 - 2¹ = 646966927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646966927) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 810337 + ... + 811134.

It is an arithmetic number, because the mean of its divisors is an integer number (64858880).

Almost surely, 2^646966929 is an apocalyptic number.

It is an amenable number.

646966929 is a deficient number, since it is larger than the sum of its proper divisors (390775151).

646966929 is a wasteful number, since it uses less digits than its factorization.

646966929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621500.

The product of its digits is 7558272, while the sum is 57.

The square root of 646966929 is about 25435.5445980620. The cubic root of 646966929 is about 864.8896376512.

The spelling of 646966929 in words is "six hundred forty-six million, nine hundred sixty-six thousand, nine hundred twenty-nine".