215128338 has 16 divisors (see below), whose sum is σ = 448963776. Its totient is φ = 68591600.

The previous prime is 215128327. The next prime is 215128349. The reversal of 215128338 is 833821512.

It is an interprime number because it is at equal distance from previous prime (215128327) and next prime (215128349).

It is a junction number, because it is equal to n+sod(n) for n = 215128299 and 215128308.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 779313 + ... + 779588.

It is an arithmetic number, because the mean of its divisors is an integer number (28060236).

Almost surely, 2^215128338 is an apocalyptic number.

215128338 is an abundant number, since it is smaller than the sum of its proper divisors (233835438).

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

215128338 is a wasteful number, since it uses less digits than its factorization.

215128338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558929.

The product of its digits is 11520, while the sum is 33.

The square root of 215128338 is about 14667.2539352123. The cubic root of 215128338 is about 599.1918174459.

The spelling of 215128338 in words is "two hundred fifteen million, one hundred twenty-eight thousand, three hundred thirty-eight".