216564254 has 16 divisors (see below), whose sum is σ = 338679792. Its totient is φ = 103766208.

The previous prime is 216564253. The next prime is 216564259. The reversal of 216564254 is 452465612.

It is a super-2 number, since 2×216564254² = 93800152221153032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216564253) 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, 19199 + ... + 28314.

It is an arithmetic number, because the mean of its divisors is an integer number (21167487).

Almost surely, 2^216564254 is an apocalyptic number.

216564254 is a deficient number, since it is larger than the sum of its proper divisors (122115538).

216564254 is a wasteful number, since it uses less digits than its factorization.

216564254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47611.

The product of its digits is 57600, while the sum is 35.

The square root of 216564254 is about 14716.1222473857. The cubic root of 216564254 is about 600.5220031303.

The spelling of 216564254 in words is "two hundred sixteen million, five hundred sixty-four thousand, two hundred fifty-four".