630759978 has 24 divisors (see below), whose sum is σ = 1377412608. Its totient is φ = 208597032.

The previous prime is 630759923. The next prime is 630759989. The reversal of 630759978 is 879957036.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135676 + ... + 140247.

It is an arithmetic number, because the mean of its divisors is an integer number (57392192).

Almost surely, 2^630759978 is an apocalyptic number.

630759978 is an abundant number, since it is smaller than the sum of its proper divisors (746652630).

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

630759978 is a wasteful number, since it uses less digits than its factorization.

630759978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276058 (or 276055 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 630759978 is about 25114.9353572730. The cubic root of 630759978 is about 857.6064588024.

The spelling of 630759978 in words is "six hundred thirty million, seven hundred fifty-nine thousand, nine hundred seventy-eight".