1630721600 has 168 divisors, whose sum is σ = 4285975680. Its totient is φ = 608542720.

The previous prime is 1630721593. The next prime is 1630721639. The reversal of 1630721600 is 61270361.

It is a self number, because there is not a number n which added to its sum of digits gives 1630721600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4542221 + ... + 4542579.

It is an arithmetic number, because the mean of its divisors is an integer number (25511760).

Almost surely, 2^1630721600 is an apocalyptic number.

1630721600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1630721600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2142987840).

1630721600 is an abundant number, since it is smaller than the sum of its proper divisors (2655254080).

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

1630721600 is a wasteful number, since it uses less digits than its factorization.

1630721600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1630721600 is about 40382.1940959131. The cubic root of 1630721600 is about 1177.0455631044.

Adding to 1630721600 its reverse (61270361), we get a palindrome (1691991961).

The spelling of 1630721600 in words is "one billion, six hundred thirty million, seven hundred twenty-one thousand, six hundred".