630545780 has 48 divisors (see below), whose sum is σ = 1401079680. Its totient is φ = 237702528.

The previous prime is 630545767. The next prime is 630545789. The reversal of 630545780 is 87545036.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630545789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70649 + ... + 79071.

It is an arithmetic number, because the mean of its divisors is an integer number (29189160).

Almost surely, 2^630545780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 630545780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (700539840).

630545780 is an abundant number, since it is smaller than the sum of its proper divisors (770533900).

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

630545780 is a wasteful number, since it uses less digits than its factorization.

630545780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8648 (or 8646 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 630545780 is about 25110.6706401880. The cubic root of 630545780 is about 857.5093704263.

The spelling of 630545780 in words is "six hundred thirty million, five hundred forty-five thousand, seven hundred eighty".