216578396 has 24 divisors (see below), whose sum is σ = 397039104. Its totient is φ = 103175600.

The previous prime is 216578377. The next prime is 216578423. The reversal of 216578396 is 693875612.

It is a super-2 number, since 2×216578396² = 93812403227865632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216578396.

It is a congruent number.

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, 19721 + ... + 28671.

It is an arithmetic number, because the mean of its divisors is an integer number (16543296).

Almost surely, 2^216578396 is an apocalyptic number.

It is an amenable number.

216578396 is a deficient number, since it is larger than the sum of its proper divisors (180460708).

216578396 is a wasteful number, since it uses less digits than its factorization.

216578396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9241 (or 9239 counting only the distinct ones).

The product of its digits is 544320, while the sum is 47.

The square root of 216578396 is about 14716.6027329680. The cubic root of 216578396 is about 600.5350745354.

The spelling of 216578396 in words is "two hundred sixteen million, five hundred seventy-eight thousand, three hundred ninety-six".