216499787 has 12 divisors (see below), whose sum is σ = 252272880. Its totient is φ = 185257296.

The previous prime is 216499781. The next prime is 216499807. The reversal of 216499787 is 787994612.

It is not a de Polignac number, because 216499787 - 2¹⁸ = 216237643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216499781) 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, 28289 + ... + 35117.

It is an arithmetic number, because the mean of its divisors is an integer number (21022740).

Almost surely, 2^216499787 is an apocalyptic number.

216499787 is a deficient number, since it is larger than the sum of its proper divisors (35773093).

216499787 is an equidigital number, since it uses as much as digits as its factorization.

216499787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7490 (or 7483 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 53.

The square root of 216499787 is about 14713.9317315257. The cubic root of 216499787 is about 600.4624092786.

The spelling of 216499787 in words is "two hundred sixteen million, four hundred ninety-nine thousand, seven hundred eighty-seven".