868690821 has 8 divisors (see below), whose sum is σ = 1186504704. Its totient is φ = 565002080.

The previous prime is 868690789. The next prime is 868690831. The reversal of 868690821 is 128096868.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 868690821 - 2⁵ = 868690789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868690831) 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, 3531141 + ... + 3531386.

It is an arithmetic number, because the mean of its divisors is an integer number (148313088).

Almost surely, 2^868690821 is an apocalyptic number.

It is an amenable number.

868690821 is a deficient number, since it is larger than the sum of its proper divisors (317813883).

868690821 is a wasteful number, since it uses less digits than its factorization.

868690821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062571.

The product of its (nonzero) digits is 331776, while the sum is 48.

The square root of 868690821 is about 29473.5613898287. The cubic root of 868690821 is about 954.1611818868.

The spelling of 868690821 in words is "eight hundred sixty-eight million, six hundred ninety thousand, eight hundred twenty-one".