128821274 has 8 divisors (see below), whose sum is σ = 204598548. Its totient is φ = 60621760.

The previous prime is 128821267. The next prime is 128821279. The reversal of 128821274 is 472128821.

It can be written as a sum of positive squares in 2 ways, for example, as 114811225 + 14010049 = 10715^2 + 3743^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×128821274³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128821279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1894397 + ... + 1894464.

Almost surely, 2^128821274 is an apocalyptic number.

128821274 is a deficient number, since it is larger than the sum of its proper divisors (75777274).

128821274 is a wasteful number, since it uses less digits than its factorization.

128821274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3788880.

The product of its digits is 14336, while the sum is 35.

The square root of 128821274 is about 11349.9459910609. The cubic root of 128821274 is about 505.0439774792.

The spelling of 128821274 in words is "one hundred twenty-eight million, eight hundred twenty-one thousand, two hundred seventy-four".