85640783 has 2 divisors, whose sum is σ = 85640784. Its totient is φ = 85640782.

The previous prime is 85640749. The next prime is 85640813. The reversal of 85640783 is 38704658.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85640783 - 2¹² = 85636687 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85640783.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85640743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42820391 + 42820392.

It is an arithmetic number, because the mean of its divisors is an integer number (42820392).

Almost surely, 2^85640783 is an apocalyptic number.

85640783 is a deficient number, since it is larger than the sum of its proper divisors (1).

85640783 is an equidigital number, since it uses as much as digits as its factorization.

85640783 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 85640783 is about 9254.2305460800. The cubic root of 85640783 is about 440.7850705114.

The spelling of 85640783 in words is "eighty-five million, six hundred forty thousand, seven hundred eighty-three".