1321899264 has 270 divisors, whose sum is σ = 4588725834. Its totient is φ = 377395200.

The previous prime is 1321899253. The next prime is 1321899283. The reversal of 1321899264 is 4629981231.

It can be written as a sum of positive squares in only one way, i.e., 686859264 + 635040000 = 26208^2 + 25200^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1015414 + ... + 1016714.

Almost surely, 2^1321899264 is an apocalyptic number.

1321899264 is a gapful number since it is divisible by the number (14) 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 1321899264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2294362917).

1321899264 is an abundant number, since it is smaller than the sum of its proper divisors (3266826570).

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

1321899264 is an equidigital number, since it uses as much as digits as its factorization.

1321899264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1313 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 1321899264 is about 36357.9326144928. The cubic root of 1321899264 is about 1097.4871742975.

The spelling of 1321899264 in words is "one billion, three hundred twenty-one million, eight hundred ninety-nine thousand, two hundred sixty-four".