630978 has 16 divisors (see below), whose sum is σ = 1275456. Its totient is φ = 208080.

The previous prime is 630967. The next prime is 630997. The reversal of 630978 is 879036.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108 + ... + 1128.

It is an arithmetic number, because the mean of its divisors is an integer number (79716).

2⁶³⁰⁹⁷⁸ is an apocalyptic number.

630978 is an abundant number, since it is smaller than the sum of its proper divisors (644478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

630978 is a wasteful number, since it uses less digits than its factorization.

630978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 630978 is about 794.3412364973. The cubic root of 630978 is about 85.7705257893.

The spelling of 630978 in words is "six hundred thirty thousand, nine hundred seventy-eight".