1320929680 has 80 divisors (see below), whose sum is σ = 3544130304. Its totient is φ = 448473600.

The previous prime is 1320929657. The next prime is 1320929681. The reversal of 1320929680 is 869290231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1320929681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46230 + ... + 69130.

Almost surely, 2^1320929680 is an apocalyptic number.

1320929680 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 1320929680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1772065152).

1320929680 is an abundant number, since it is smaller than the sum of its proper divisors (2223200624).

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

1320929680 is a wasteful number, since it uses less digits than its factorization.

1320929680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23024 (or 23018 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 1320929680 is about 36344.5962971113. The cubic root of 1320929680 is about 1097.2187811086.

The spelling of 1320929680 in words is "one billion, three hundred twenty million, nine hundred twenty-nine thousand, six hundred eighty".