630778 has 4 divisors (see below), whose sum is σ = 946170. Its totient is φ = 315388.

The previous prime is 630737. The next prime is 630797. The reversal of 630778 is 877036.

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., 613089 + 17689 = 783^2 + 133^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157693 + ... + 157696.

2⁶³⁰⁷⁷⁸ is an apocalyptic number.

630778 is a deficient number, since it is larger than the sum of its proper divisors (315392).

630778 is a wasteful number, since it uses less digits than its factorization.

630778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315391.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 630778 is about 794.2153360393. The cubic root of 630778 is about 85.7614626535.

The spelling of 630778 in words is "six hundred thirty thousand, seven hundred seventy-eight".