828677921 has 8 divisors (see below), whose sum is σ = 835897344. Its totient is φ = 821469600.

The previous prime is 828677917. The next prime is 828677933. The reversal of 828677921 is 129776828.

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 828677921 - 2² = 828677917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 828677921.

It is not an unprimeable number, because it can be changed into a prime (828677021) 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, 226916 + ... + 230538.

It is an arithmetic number, because the mean of its divisors is an integer number (104487168).

Almost surely, 2^828677921 is an apocalyptic number.

It is an amenable number.

828677921 is a deficient number, since it is larger than the sum of its proper divisors (7219423).

828677921 is a wasteful number, since it uses less digits than its factorization.

828677921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5551.

The product of its digits is 677376, while the sum is 50.

The square root of 828677921 is about 28786.7664213958. The cubic root of 828677921 is about 939.2803912302.

The spelling of 828677921 in words is "eight hundred twenty-eight million, six hundred seventy-seven thousand, nine hundred twenty-one".