828677021 has 2 divisors, whose sum is σ = 828677022. Its totient is φ = 828677020.

The previous prime is 828676973. The next prime is 828677081. The reversal of 828677021 is 120776828.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 783384121 + 45292900 = 27989^2 + 6730^2 .

It is a cyclic number.

It is not a de Polignac number, because 828677021 - 2¹⁰ = 828675997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 828677021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (828677081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414338510 + 414338511.

It is an arithmetic number, because the mean of its divisors is an integer number (414338511).

Almost surely, 2^828677021 is an apocalyptic number.

It is an amenable number.

828677021 is a deficient number, since it is larger than the sum of its proper divisors (1).

828677021 is an equidigital number, since it uses as much as digits as its factorization.

828677021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 828677021 is about 28786.7507892086. The cubic root of 828677021 is about 939.2800511895.

The spelling of 828677021 in words is "eight hundred twenty-eight million, six hundred seventy-seven thousand, twenty-one".