216776477 has 8 divisors (see below), whose sum is σ = 218702400. Its totient is φ = 214856064.

The previous prime is 216776467. The next prime is 216776501. The reversal of 216776477 is 774677612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216776477 - 2²⁶ = 149667613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216776407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126893 + ... + 128589.

It is an arithmetic number, because the mean of its divisors is an integer number (27337800).

Almost surely, 2^216776477 is an apocalyptic number.

It is an amenable number.

216776477 is a deficient number, since it is larger than the sum of its proper divisors (1925923).

216776477 is a wasteful number, since it uses less digits than its factorization.

216776477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2755.

The product of its digits is 691488, while the sum is 47.

The square root of 216776477 is about 14723.3310429400. The cubic root of 216776477 is about 600.7181003954.

The spelling of 216776477 in words is "two hundred sixteen million, seven hundred seventy-six thousand, four hundred seventy-seven".