216145746 has 20 divisors (see below), whose sum is σ = 484326942. Its totient is φ = 72048528.

The previous prime is 216145739. The next prime is 216145747. The reversal of 216145746 is 647541612.

216145746 is a `hidden beast` number, since 2 + 161 + 457 + 46 = 666.

216145746 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 189365121 + 26780625 = 13761^2 + 5175^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216145746.

It is not an unprimeable number, because it can be changed into a prime (216145747) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 666955 + ... + 667278.

Almost surely, 2^216145746 is an apocalyptic number.

216145746 is an abundant number, since it is smaller than the sum of its proper divisors (268181196).

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

216145746 is a wasteful number, since it uses less digits than its factorization.

216145746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334247 (or 1334238 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 216145746 is about 14701.8960001763. The cubic root of 216145746 is about 600.1349196589.

The spelling of 216145746 in words is "two hundred sixteen million, one hundred forty-five thousand, seven hundred forty-six".