128398270 has 128 divisors (see below), whose sum is σ = 315850752. Its totient is φ = 36288000.

The previous prime is 128398267. The next prime is 128398279. The reversal of 128398270 is 72893821.

It is a super-2 number, since 2×128398270² = 32972231477985800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128398279) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1010947 + ... + 1011073.

It is an arithmetic number, because the mean of its divisors is an integer number (2467584).

Almost surely, 2^128398270 is an apocalyptic number.

128398270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128398270 is an abundant number, since it is smaller than the sum of its proper divisors (187452482).

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

128398270 is a wasteful number, since it uses less digits than its factorization.

128398270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 128398270 is about 11331.2960423775. The cubic root of 128398270 is about 504.4905753937.

The spelling of 128398270 in words is "one hundred twenty-eight million, three hundred ninety-eight thousand, two hundred seventy".