215928457394 has 16 divisors (see below), whose sum is σ = 350048827800. Its totient is φ = 99304625280.

The previous prime is 215928457373. The next prime is 215928457403. The reversal of 215928457394 is 493754829512.

It can be written as a sum of positive squares in 4 ways, for example, as 104676190369 + 111252267025 = 323537^2 + 333545^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14770169 + ... + 14784780.

Almost surely, 2^215928457394 is an apocalyptic number.

215928457394 is a deficient number, since it is larger than the sum of its proper divisors (134120370406).

215928457394 is a wasteful number, since it uses less digits than its factorization.

215928457394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29555245.

The product of its digits is 21772800, while the sum is 59.

The spelling of 215928457394 in words is "two hundred fifteen billion, nine hundred twenty-eight million, four hundred fifty-seven thousand, three hundred ninety-four".