215320128676 has 9 divisors (see below), whose sum is σ = 376811849281. Its totient is φ = 107659600312.

The previous prime is 215320128659. The next prime is 215320128719. The reversal of 215320128676 is 676821023512.

The square root of 215320128676 is 464026.

It is a perfect power (a square), and thus also a powerful number.

215320128676 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 166733388900 + 48586739776 = 408330^2 + 220424^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 812046 + ... + 1044058.

Almost surely, 2^215320128676 is an apocalyptic number.

215320128676 is the 464026-th square number.

It is an amenable number.

215320128676 is a deficient number, since it is larger than the sum of its proper divisors (161491720605).

215320128676 is an frugal number, since it uses more digits than its factorization.

215320128676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464030 (or 232015 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 215320128676 in words is "two hundred fifteen billion, three hundred twenty million, one hundred twenty-eight thousand, six hundred seventy-six".