1646720130 has 128 divisors (see below), whose sum is σ = 4628710656. Its totient is φ = 370483200.

The previous prime is 1646720107. The next prime is 1646720143. The reversal of 1646720130 is 310276461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

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 63 ways as a sum of consecutive naturals, for example, 407520 + ... + 411540.

It is an arithmetic number, because the mean of its divisors is an integer number (36161802).

Almost surely, 2^1646720130 is an apocalyptic number.

1646720130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646720130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2314355328).

1646720130 is an abundant number, since it is smaller than the sum of its proper divisors (2981990526).

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

1646720130 is a wasteful number, since it uses less digits than its factorization.

1646720130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4132.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1646720130 is about 40579.7995312939. The cubic root of 1646720130 is about 1180.8822593705.

Adding to 1646720130 its reverse (310276461), we get a palindrome (1956996591).

The spelling of 1646720130 in words is "one billion, six hundred forty-six million, seven hundred twenty thousand, one hundred thirty".