1329504640 has 32 divisors (see below), whose sum is σ = 3178348560. Its totient is φ = 531801600.

The previous prime is 1329504637. The next prime is 1329504653. The reversal of 1329504640 is 464059231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 1329504596 and 1329504605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1038036 + ... + 1039315.

Almost surely, 2^1329504640 is an apocalyptic number.

1329504640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1329504640 is an abundant number, since it is smaller than the sum of its proper divisors (1848843920).

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

1329504640 is an equidigital number, since it uses as much as digits as its factorization.

1329504640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077370 (or 2077358 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1329504640 is about 36462.3729343004. The cubic root of 1329504640 is about 1099.5879007286.

The spelling of 1329504640 in words is "one billion, three hundred twenty-nine million, five hundred four thousand, six hundred forty".