216491700 has 108 divisors (see below), whose sum is σ = 661416000. Its totient is φ = 54665280.

The previous prime is 216491689. The next prime is 216491701. The reversal of 216491700 is 7194612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216491701) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 107301 + ... + 109299.

Almost surely, 2^216491700 is an apocalyptic number.

216491700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216491700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330708000).

216491700 is an abundant number, since it is smaller than the sum of its proper divisors (444924300).

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

216491700 is a wasteful number, since it uses less digits than its factorization.

216491700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054 (or 2028 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 216491700 is about 14713.6569213775. The cubic root of 216491700 is about 600.4549327509.

The spelling of 216491700 in words is "two hundred sixteen million, four hundred ninety-one thousand, seven hundred".