629985256 has 8 divisors (see below), whose sum is σ = 1181222370. Its totient is φ = 314992624.

The previous prime is 629985253. The next prime is 629985259. The reversal of 629985256 is 652589926.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (629985253) and next prime (629985259).

It can be written as a sum of positive squares in only one way, i.e., 398641156 + 231344100 = 19966^2 + 15210^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (629985253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39374071 + ... + 39374086.

Almost surely, 2^629985256 is an apocalyptic number.

It is an amenable number.

629985256 is a deficient number, since it is larger than the sum of its proper divisors (551237114).

629985256 is a wasteful number, since it uses less digits than its factorization.

629985256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78748163 (or 78748159 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 52.

The square root of 629985256 is about 25099.5070867936. The cubic root of 629985256 is about 857.2552006293.

The spelling of 629985256 in words is "six hundred twenty-nine million, nine hundred eighty-five thousand, two hundred fifty-six".