85220783 has 2 divisors, whose sum is σ = 85220784. Its totient is φ = 85220782.

The previous prime is 85220777. The next prime is 85220791. The reversal of 85220783 is 38702258.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85220783 - 2²² = 81026479 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85220753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42610391 + 42610392.

It is an arithmetic number, because the mean of its divisors is an integer number (42610392).

Almost surely, 2^85220783 is an apocalyptic number.

85220783 is a deficient number, since it is larger than the sum of its proper divisors (1).

85220783 is an equidigital number, since it uses as much as digits as its factorization.

85220783 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 85220783 is about 9231.5103314680. The cubic root of 85220783 is about 440.0633224981.

The spelling of 85220783 in words is "eighty-five million, two hundred twenty thousand, seven hundred eighty-three".