128497320 has 256 divisors, whose sum is σ = 511488000. Its totient is φ = 28055808.

The previous prime is 128497309. The next prime is 128497331. The reversal of 128497320 is 23794821.

It is an interprime number because it is at equal distance from previous prime (128497309) and next prime (128497331).

It is a super-2 number, since 2×128497320² = 33023122494364800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 173511 + ... + 174249.

It is an arithmetic number, because the mean of its divisors is an integer number (1998000).

Almost surely, 2^128497320 is an apocalyptic number.

128497320 is a gapful number since it is divisible by the number (10) 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 128497320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255744000).

128497320 is an abundant number, since it is smaller than the sum of its proper divisors (382990680).

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

128497320 is a wasteful number, since it uses less digits than its factorization.

128497320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 128497320 is about 11335.6658384058. The cubic root of 128497320 is about 504.6202680748.

The spelling of 128497320 in words is "one hundred twenty-eight million, four hundred ninety-seven thousand, three hundred twenty".