1331648420 has 36 divisors (see below), whose sum is σ = 2970648660. Its totient is φ = 501324288.

The previous prime is 1331648401. The next prime is 1331648441. The reversal of 1331648420 is 248461331.

It can be written as a sum of positive squares in 6 ways, for example, as 89226916 + 1242421504 = 9446^2 + 35248^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109415 + ... + 120974.

Almost surely, 2^1331648420 is an apocalyptic number.

1331648420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331648420 is an abundant number, since it is smaller than the sum of its proper divisors (1639000240).

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

1331648420 is a wasteful number, since it uses less digits than its factorization.

1331648420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230432 (or 230413 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 1331648420 is about 36491.7582475824. The cubic root of 1331648420 is about 1100.1785990998.

The spelling of 1331648420 in words is "one billion, three hundred thirty-one million, six hundred forty-eight thousand, four hundred twenty".