630157889 has 4 divisors (see below), whose sum is σ = 630235056. Its totient is φ = 630080724.

The previous prime is 630157867. The next prime is 630157903. The reversal of 630157889 is 988751036.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-630157889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630157789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24659 + ... + 43224.

It is an arithmetic number, because the mean of its divisors is an integer number (157558764).

Almost surely, 2^630157889 is an apocalyptic number.

It is an amenable number.

630157889 is a deficient number, since it is larger than the sum of its proper divisors (77167).

630157889 is an equidigital number, since it uses as much as digits as its factorization.

630157889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77166.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 630157889 is about 25102.9458231499. The cubic root of 630157889 is about 857.3334971819. Note that the first 3 decimals are identical.

The spelling of 630157889 in words is "six hundred thirty million, one hundred fifty-seven thousand, eight hundred eighty-nine".