878221997 has 8 divisors (see below), whose sum is σ = 892077312. Its totient is φ = 864388800.

The previous prime is 878221979. The next prime is 878222017. The reversal of 878221997 is 799122878.

It is a happy number.

878221997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-878221997 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878221937) 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, 86372 + ... + 96002.

It is an arithmetic number, because the mean of its divisors is an integer number (111509664).

Almost surely, 2^878221997 is an apocalyptic number.

It is an amenable number.

878221997 is a deficient number, since it is larger than the sum of its proper divisors (13855315).

878221997 is a wasteful number, since it uses less digits than its factorization.

878221997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11059.

The product of its digits is 1016064, while the sum is 53.

The square root of 878221997 is about 29634.8105612302. The cubic root of 878221997 is about 957.6381454381.

The spelling of 878221997 in words is "eight hundred seventy-eight million, two hundred twenty-one thousand, nine hundred ninety-seven".