646380033 has 32 divisors (see below), whose sum is σ = 951793920. Its totient is φ = 387763200.

The previous prime is 646380023. The next prime is 646380037. The reversal of 646380033 is 330083646.

It is not a de Polignac number, because 646380033 - 2¹⁰ = 646379009 is a prime.

It is a super-2 number, since 2×646380033² = 835614294122162178, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 646379976 and 646380003.

It is not an unprimeable number, because it can be changed into a prime (646380037) 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 31 ways as a sum of consecutive naturals, for example, 252108 + ... + 254658.

It is an arithmetic number, because the mean of its divisors is an integer number (29743560).

Almost surely, 2^646380033 is an apocalyptic number.

It is an amenable number.

646380033 is a deficient number, since it is larger than the sum of its proper divisors (305413887).

646380033 is a wasteful number, since it uses less digits than its factorization.

646380033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729.

The product of its (nonzero) digits is 31104, while the sum is 33.

The square root of 646380033 is about 25424.0050542789. The cubic root of 646380033 is about 864.6280303401.

The spelling of 646380033 in words is "six hundred forty-six million, three hundred eighty thousand, thirty-three".