216936258 has 64 divisors (see below), whose sum is σ = 542592000. Its totient is φ = 56174400.

The previous prime is 216936241. The next prime is 216936259. The reversal of 216936258 is 852639612.

It is a super-2 number, since 2×216936258² = 94122680070085128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (216936259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 230068 + ... + 231008.

It is an arithmetic number, because the mean of its divisors is an integer number (8478000).

Almost surely, 2^216936258 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216936258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271296000).

216936258 is an abundant number, since it is smaller than the sum of its proper divisors (325655742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216936258 is a wasteful number, since it uses less digits than its factorization.

216936258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463.

The product of its digits is 155520, while the sum is 42.

The square root of 216936258 is about 14728.7561592960. The cubic root of 216936258 is about 600.8656560210.

The spelling of 216936258 in words is "two hundred sixteen million, nine hundred thirty-six thousand, two hundred fifty-eight".