629978 has 4 divisors (see below), whose sum is σ = 944970. Its totient is φ = 314988.

The previous prime is 629977. The next prime is 629987. The reversal of 629978 is 879926.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 619369 + 10609 = 787^2 + 103^2 .

It is not an unprimeable number, because it can be changed into a prime (629977) 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 as a sum of consecutive naturals, namely, 157493 + ... + 157496.

2⁶²⁹⁹⁷⁸ is an apocalyptic number.

629978 is a deficient number, since it is larger than the sum of its proper divisors (314992).

629978 is a wasteful number, since it uses less digits than its factorization.

629978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314991.

The product of its digits is 54432, while the sum is 41.

The square root of 629978 is about 793.7115345010. The cubic root of 629978 is about 85.7251909405.

The spelling of 629978 in words is "six hundred twenty-nine thousand, nine hundred seventy-eight".