867966721 has 4 divisors (see below), whose sum is σ = 913649200. Its totient is φ = 822284244.

The previous prime is 867966713. The next prime is 867966731. The reversal of 867966721 is 127669768.

It is a happy number.

867966721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 867966721 - 2³ = 867966713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (867966731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22841211 + ... + 22841248.

It is an arithmetic number, because the mean of its divisors is an integer number (228412300).

Almost surely, 2^867966721 is an apocalyptic number.

It is an amenable number.

867966721 is a deficient number, since it is larger than the sum of its proper divisors (45682479).

867966721 is a wasteful number, since it uses less digits than its factorization.

867966721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45682478.

The product of its digits is 1524096, while the sum is 52.

The square root of 867966721 is about 29461.2749384680. The cubic root of 867966721 is about 953.8959934931.

The spelling of 867966721 in words is "eight hundred sixty-seven million, nine hundred sixty-six thousand, seven hundred twenty-one".