85028821 has 2 divisors, whose sum is σ = 85028822. Its totient is φ = 85028820.

The previous prime is 85028809. The next prime is 85028831. The reversal of 85028821 is 12882058.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59120721 + 25908100 = 7689^2 + 5090^2 .

It is a cyclic number.

It is not a de Polignac number, because 85028821 - 2¹⁵ = 84996053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85028831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42514410 + 42514411.

It is an arithmetic number, because the mean of its divisors is an integer number (42514411).

Almost surely, 2^85028821 is an apocalyptic number.

It is an amenable number.

85028821 is a deficient number, since it is larger than the sum of its proper divisors (1).

85028821 is an equidigital number, since it uses as much as digits as its factorization.

85028821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 85028821 is about 9221.1073630015. The cubic root of 85028821 is about 439.7326561210.

It can be divided in two parts, 85028 and 821, that added together give a square (85849 = 293²).

The spelling of 85028821 in words is "eighty-five million, twenty-eight thousand, eight hundred twenty-one".