1328606720 has 160 divisors (see below), whose sum is σ = 3672193536. Its totient is φ = 451584000.

The previous prime is 1328606641. The next prime is 1328606737. The reversal of 1328606720 is 276068231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 2705675 + ... + 2706165.

Almost surely, 2^1328606720 is an apocalyptic number.

1328606720 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 1328606720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1836096768).

1328606720 is an abundant number, since it is smaller than the sum of its proper divisors (2343586816).

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

1328606720 is an equidigital number, since it uses as much as digits as its factorization.

1328606720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 672 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 1328606720 is about 36450.0578874712. The cubic root of 1328606720 is about 1099.3402986523.

The spelling of 1328606720 in words is "one billion, three hundred twenty-eight million, six hundred six thousand, seven hundred twenty".