216640677 has 16 divisors (see below), whose sum is σ = 315611712. Its totient is φ = 131089920.

The previous prime is 216640637. The next prime is 216640729. The reversal of 216640677 is 776046612.

It is not a de Polignac number, because 216640677 - 2¹⁴ = 216624293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216640637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17493 + ... + 27189.

It is an arithmetic number, because the mean of its divisors is an integer number (19725732).

Almost surely, 2^216640677 is an apocalyptic number.

It is an amenable number.

216640677 is a deficient number, since it is larger than the sum of its proper divisors (98971035).

216640677 is a wasteful number, since it uses less digits than its factorization.

216640677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10388.

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 216640677 is about 14718.7185923232. The cubic root of 216640677 is about 600.5926338935.

The spelling of 216640677 in words is "two hundred sixteen million, six hundred forty thousand, six hundred seventy-seven".