215128948 has 24 divisors (see below), whose sum is σ = 402163272. Its totient is φ = 100337664.

The previous prime is 215128943. The next prime is 215128967. The reversal of 215128948 is 849821512.

It can be written as a sum of positive squares in 4 ways, for example, as 46076944 + 169052004 = 6788^2 + 13002^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215128948.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215128943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6315 + ... + 21682.

It is an arithmetic number, because the mean of its divisors is an integer number (16756803).

Almost surely, 2^215128948 is an apocalyptic number.

It is an amenable number.

215128948 is a deficient number, since it is larger than the sum of its proper divisors (187034324).

215128948 is a wasteful number, since it uses less digits than its factorization.

215128948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28131 (or 28129 counting only the distinct ones).

The product of its digits is 46080, while the sum is 40.

The square root of 215128948 is about 14667.2747298194. The cubic root of 215128948 is about 599.1923837849.

The spelling of 215128948 in words is "two hundred fifteen million, one hundred twenty-eight thousand, nine hundred forty-eight".