630442906 has 4 divisors (see below), whose sum is σ = 945664362. Its totient is φ = 315221452.

The previous prime is 630442849. The next prime is 630442957. The reversal of 630442906 is 609244036.

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., 527115681 + 103327225 = 22959^2 + 10165^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157610725 + ... + 157610728.

Almost surely, 2^630442906 is an apocalyptic number.

630442906 is a deficient number, since it is larger than the sum of its proper divisors (315221456).

630442906 is a wasteful number, since it uses less digits than its factorization.

630442906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315221455.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 630442906 is about 25108.6221445941. The cubic root of 630442906 is about 857.4627334653.

The spelling of 630442906 in words is "six hundred thirty million, four hundred forty-two thousand, nine hundred six".