646031633 has 8 divisors (see below), whose sum is σ = 696427368. Its totient is φ = 595736064.

The previous prime is 646031623. The next prime is 646031689. The reversal of 646031633 is 336130646.

It can be written as a sum of positive squares in 4 ways, for example, as 7744 + 646023889 = 88^2 + 25417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646031633 - 2⁸ = 646031377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646031633.

It is not an unprimeable number, because it can be changed into a prime (646031623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11360 + ... + 37697.

It is an arithmetic number, because the mean of its divisors is an integer number (87053421).

Almost surely, 2^646031633 is an apocalyptic number.

It is an amenable number.

646031633 is a deficient number, since it is larger than the sum of its proper divisors (50395735).

646031633 is a wasteful number, since it uses less digits than its factorization.

646031633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50083.

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 646031633 is about 25417.1523385292. The cubic root of 646031633 is about 864.4726570669.

The spelling of 646031633 in words is "six hundred forty-six million, thirty-one thousand, six hundred thirty-three".