630749 has 4 divisors (see below), whose sum is σ = 720864. Its totient is φ = 540636.

The previous prime is 630737. The next prime is 630797. The reversal of 630749 is 947036.

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 not a de Polignac number, because 630749 - 2⁴ = 630733 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630709) 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, 45047 + ... + 45060.

It is an arithmetic number, because the mean of its divisors is an integer number (180216).

2⁶³⁰⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

630749 is a deficient number, since it is larger than the sum of its proper divisors (90115).

630749 is an equidigital number, since it uses as much as digits as its factorization.

630749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90114.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 630749 is about 794.1970788161. The cubic root of 630749 is about 85.7601483398.

The spelling of 630749 in words is "six hundred thirty thousand, seven hundred forty-nine".