216171700 has 36 divisors (see below), whose sum is σ = 470055852. Its totient is φ = 86291200.

The previous prime is 216171673. The next prime is 216171701. The reversal of 216171700 is 7171612.

It can be written as a sum of positive squares in 6 ways, for example, as 21178404 + 194993296 = 4602^2 + 13964^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216171701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53760 + ... + 57640.

It is an arithmetic number, because the mean of its divisors is an integer number (13057107).

Almost surely, 2^216171700 is an apocalyptic number.

216171700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216171700 is an abundant number, since it is smaller than the sum of its proper divisors (253884152).

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

216171700 is a wasteful number, since it uses less digits than its factorization.

216171700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4452 (or 4445 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 216171700 is about 14702.7786489493. The cubic root of 216171700 is about 600.1589393749.

The spelling of 216171700 in words is "two hundred sixteen million, one hundred seventy-one thousand, seven hundred".