1329621320 has 16 divisors (see below), whose sum is σ = 2991648060. Its totient is φ = 531848512.

The previous prime is 1329621301. The next prime is 1329621379. The reversal of 1329621320 is 231269231.

It can be written as a sum of positive squares in 2 ways, for example, as 1288379236 + 41242084 = 35894^2 + 6422^2 .

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, 16620227 + ... + 16620306.

Almost surely, 2^1329621320 is an apocalyptic number.

1329621320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1329621320 is an abundant number, since it is smaller than the sum of its proper divisors (1662026740).

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

1329621320 is a wasteful number, since it uses less digits than its factorization.

1329621320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33240544 (or 33240540 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1329621320 is about 36463.9729047727. The cubic root of 1329621320 is about 1099.6200671359.

The spelling of 1329621320 in words is "one billion, three hundred twenty-nine million, six hundred twenty-one thousand, three hundred twenty".