216772737 has 4 divisors (see below), whose sum is σ = 289030320. Its totient is φ = 144515156.

The previous prime is 216772681. The next prime is 216772783. The reversal of 216772737 is 737277612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216772737 - 2¹² = 216768641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216772337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36128787 + ... + 36128792.

It is an arithmetic number, because the mean of its divisors is an integer number (72257580).

Almost surely, 2^216772737 is an apocalyptic number.

It is an amenable number.

216772737 is a deficient number, since it is larger than the sum of its proper divisors (72257583).

216772737 is an equidigital number, since it uses as much as digits as its factorization.

216772737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72257582.

The product of its digits is 172872, while the sum is 42.

The square root of 216772737 is about 14723.2040330901. The cubic root of 216772737 is about 600.7146456868.

The spelling of 216772737 in words is "two hundred sixteen million, seven hundred seventy-two thousand, seven hundred thirty-seven".