216100686 has 16 divisors (see below), whose sum is σ = 450993024. Its totient is φ = 68901624.

The previous prime is 216100681. The next prime is 216100691. The reversal of 216100686 is 686001612.

It is an interprime number because it is at equal distance from previous prime (216100681) and next prime (216100691).

It is a super-4 number, since 4×216100686⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216100681) 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, 782836 + ... + 783111.

It is an arithmetic number, because the mean of its divisors is an integer number (28187064).

Almost surely, 2^216100686 is an apocalyptic number.

216100686 is an abundant number, since it is smaller than the sum of its proper divisors (234892338).

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

216100686 is a wasteful number, since it uses less digits than its factorization.

216100686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565975.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 216100686 is about 14700.3634648943. The cubic root of 216100686 is about 600.0932132958.

The spelling of 216100686 in words is "two hundred sixteen million, one hundred thousand, six hundred eighty-six".