640961029 has 8 divisors (see below), whose sum is σ = 675360000. Its totient is φ = 606628512.

The previous prime is 640961023. The next prime is 640961039. The reversal of 640961029 is 920169046.

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 640961029 - 2⁹ = 640960517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640961023) 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, 3852 + ... + 36010.

It is an arithmetic number, because the mean of its divisors is an integer number (84420000).

Almost surely, 2^640961029 is an apocalyptic number.

It is an amenable number.

640961029 is a deficient number, since it is larger than the sum of its proper divisors (34398971).

640961029 is a wasteful number, since it uses less digits than its factorization.

640961029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33227.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 640961029 is about 25317.2081596688. The cubic root of 640961029 is about 862.2050090821.

The spelling of 640961029 in words is "six hundred forty million, nine hundred sixty-one thousand, twenty-nine".