1630243980 has 144 divisors (see below), whose sum is σ = 5018255424. Its totient is φ = 428359680.

The previous prime is 1630243969. The next prime is 1630243991. The reversal of 1630243980 is 893420361.

It is an interprime number because it is at equal distance from previous prime (1630243969) and next prime (1630243991).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 5801440 + ... + 5801720.

It is an arithmetic number, because the mean of its divisors is an integer number (34848996).

Almost surely, 2^1630243980 is an apocalyptic number.

1630243980 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 1630243980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2509127712).

1630243980 is an abundant number, since it is smaller than the sum of its proper divisors (3388011444).

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

1630243980 is a wasteful number, since it uses less digits than its factorization.

1630243980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 1630243980 is about 40376.2799177933. The cubic root of 1630243980 is about 1176.9306374183.

The spelling of 1630243980 in words is "one billion, six hundred thirty million, two hundred forty-three thousand, nine hundred eighty".