128391562 has 8 divisors (see below), whose sum is σ = 207401796. Its totient is φ = 59257632.

The previous prime is 128391533. The next prime is 128391619. The reversal of 128391562 is 265193821.

It is a Cunningham number, because it is equal to 11331²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 128391561 + 1 = 11331^2 + 1^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2469043 + ... + 2469094.

Almost surely, 2^128391562 is an apocalyptic number.

128391562 is a deficient number, since it is larger than the sum of its proper divisors (79010234).

128391562 is a wasteful number, since it uses less digits than its factorization.

128391562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4938152.

The product of its digits is 25920, while the sum is 37.

The square root of 128391562 is about 11331.0000441267. Note that the first 4 decimals coincide. The cubic root of 128391562 is about 504.4817897569.

The spelling of 128391562 in words is "one hundred twenty-eight million, three hundred ninety-one thousand, five hundred sixty-two".