216767634 has 16 divisors (see below), whose sum is σ = 448485120. Its totient is φ = 69764240.

The previous prime is 216767633. The next prime is 216767641. The reversal of 216767634 is 436767612.

It is a happy number.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (216767633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622722 + ... + 623069.

It is an arithmetic number, because the mean of its divisors is an integer number (28030320).

Almost surely, 2^216767634 is an apocalyptic number.

216767634 is an abundant number, since it is smaller than the sum of its proper divisors (231717486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216767634 is a wasteful number, since it uses less digits than its factorization.

216767634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245825.

The product of its digits is 254016, while the sum is 42.

The square root of 216767634 is about 14723.0307341933. The cubic root of 216767634 is about 600.7099318854.

The spelling of 216767634 in words is "two hundred sixteen million, seven hundred sixty-seven thousand, six hundred thirty-four".