1961604000 has 384 divisors, whose sum is σ = 7330901760. Its totient is φ = 509184000.

The previous prime is 1961603983. The next prime is 1961604011. The reversal of 1961604000 is 4061691.

1961604000 is a `hidden beast` number, since 1 + 9 + 616 + 0 + 40 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4427779 + ... + 4428221.

It is an arithmetic number, because the mean of its divisors is an integer number (19090890).

Almost surely, 2^1961604000 is an apocalyptic number.

1961604000 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 1961604000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3665450880).

1961604000 is an abundant number, since it is smaller than the sum of its proper divisors (5369297760).

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

1961604000 is a wasteful number, since it uses less digits than its factorization.

1961604000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1961604000 is about 44289.9988710770. The cubic root of 1961604000 is about 1251.8062420679.

Adding to 1961604000 its reverse (4061691), we get a palindrome (1965665691).

The spelling of 1961604000 in words is "one billion, nine hundred sixty-one million, six hundred four thousand".