629640985 has 16 divisors (see below), whose sum is σ = 834800256. Its totient is φ = 453468928.

The previous prime is 629640967. The next prime is 629641003. The reversal of 629640985 is 589046926.

629640985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (629640967) and next prime (629641003).

It is a cyclic number.

It is not a de Polignac number, because 629640985 - 2¹⁷ = 629509913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159079 + ... + 162988.

It is an arithmetic number, because the mean of its divisors is an integer number (52175016).

Almost surely, 2^629640985 is an apocalyptic number.

It is an amenable number.

629640985 is a deficient number, since it is larger than the sum of its proper divisors (205159271).

629640985 is a wasteful number, since it uses less digits than its factorization.

629640985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322112.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 629640985 is about 25092.6480268624. The cubic root of 629640985 is about 857.0990160844.

The spelling of 629640985 in words is "six hundred twenty-nine million, six hundred forty thousand, nine hundred eighty-five".