1321776960 has 168 divisors, whose sum is σ = 4881981600. Its totient is φ = 302109696.

The previous prime is 1321776947. The next prime is 1321776997. The reversal of 1321776960 is 696771231.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 32991 + ... + 61089.

Almost surely, 2^1321776960 is an apocalyptic number.

1321776960 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 1321776960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2440990800).

1321776960 is an abundant number, since it is smaller than the sum of its proper divisors (3560204640).

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

1321776960 is a wasteful number, since it uses less digits than its factorization.

1321776960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28133 (or 28116 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 1321776960 is about 36356.2506317689. The cubic root of 1321776960 is about 1097.4533262288.

The spelling of 1321776960 in words is "one billion, three hundred twenty-one million, seven hundred seventy-six thousand, nine hundred sixty".