128320452 has 72 divisors (see below), whose sum is σ = 367727360. Its totient is φ = 37402560.

The previous prime is 128320441. The next prime is 128320463. The reversal of 128320452 is 254023821.

It is an interprime number because it is at equal distance from previous prime (128320441) and next prime (128320463).

It is a super-2 number, since 2×128320452² = 32932276802968608, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1677 + ... + 16107.

Almost surely, 2^128320452 is an apocalyptic number.

128320452 is a gapful number since it is divisible by the number (12) 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 128320452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183863680).

128320452 is an abundant number, since it is smaller than the sum of its proper divisors (239406908).

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

128320452 is a wasteful number, since it uses less digits than its factorization.

128320452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14473 (or 14468 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 128320452 is about 11327.8617576310. The cubic root of 128320452 is about 504.3886363739.

The spelling of 128320452 in words is "one hundred twenty-eight million, three hundred twenty thousand, four hundred fifty-two".