216764667 has 40 divisors (see below), whose sum is σ = 375208416. Its totient is φ = 122145408.

The previous prime is 216764651. The next prime is 216764701. The reversal of 216764667 is 766467612.

It is a happy number.

It is not a de Polignac number, because 216764667 - 2⁴ = 216764651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216764567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 38773 + ... + 44009.

Almost surely, 2^216764667 is an apocalyptic number.

216764667 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

216764667 is a deficient number, since it is larger than the sum of its proper divisors (158443749).

216764667 is an equidigital number, since it uses as much as digits as its factorization.

216764667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5329 (or 5320 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 216764667 is about 14722.9299733443. The cubic root of 216764667 is about 600.7071911403.

The spelling of 216764667 in words is "two hundred sixteen million, seven hundred sixty-four thousand, six hundred sixty-seven".