630391637 has 8 divisors (see below), whose sum is σ = 667693656. Its totient is φ = 593114112.

The previous prime is 630391609. The next prime is 630391667. The reversal of 630391637 is 736193036.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 152794321 + 477597316 = 12361^2 + 21854^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 630391637 - 2²⁶ = 563282773 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 630391637.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630391667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91133 + ... + 97805.

It is an arithmetic number, because the mean of its divisors is an integer number (83461707).

Almost surely, 2^630391637 is an apocalyptic number.

It is an amenable number.

630391637 is a deficient number, since it is larger than the sum of its proper divisors (37302019).

630391637 is a wasteful number, since it uses less digits than its factorization.

630391637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12247.

The product of its (nonzero) digits is 61236, while the sum is 38.

The square root of 630391637 is about 25107.6011797224. The cubic root of 630391637 is about 857.4394892518.

The spelling of 630391637 in words is "six hundred thirty million, three hundred ninety-one thousand, six hundred thirty-seven".