216687960 has 128 divisors (see below), whose sum is σ = 731505600. Its totient is φ = 57760128.

The previous prime is 216687949. The next prime is 216688063. The reversal of 216687960 is 69786612.

216687960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86242 + ... + 88718.

Almost surely, 2^216687960 is an apocalyptic number.

216687960 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 216687960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365752800).

216687960 is an abundant number, since it is smaller than the sum of its proper divisors (514817640).

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

216687960 is an equidigital number, since it uses as much as digits as its factorization.

216687960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509 (or 2487 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 216687960 is about 14720.3247246791. The cubic root of 216687960 is about 600.6363249124.

The spelling of 216687960 in words is "two hundred sixteen million, six hundred eighty-seven thousand, nine hundred sixty".