216487773 has 12 divisors (see below), whose sum is σ = 315473340. Its totient is φ = 143047296.

The previous prime is 216487763. The next prime is 216487793. The reversal of 216487773 is 377784612.

It can be written as a sum of positive squares in 2 ways, for example, as 55756089 + 160731684 = 7467^2 + 12678^2 .

It is not a de Polignac number, because 216487773 - 2⁶ = 216487709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216487763) 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, 105418 + ... + 107451.

It is an arithmetic number, because the mean of its divisors is an integer number (26289445).

Almost surely, 2^216487773 is an apocalyptic number.

It is an amenable number.

216487773 is a deficient number, since it is larger than the sum of its proper divisors (98985567).

216487773 is a wasteful number, since it uses less digits than its factorization.

216487773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212988 (or 212985 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 216487773 is about 14713.5234733221. The cubic root of 216487773 is about 600.4513021255.

The spelling of 216487773 in words is "two hundred sixteen million, four hundred eighty-seven thousand, seven hundred seventy-three".