85639667 has 2 divisors, whose sum is σ = 85639668. Its totient is φ = 85639666.

The previous prime is 85639663. The next prime is 85639691. The reversal of 85639667 is 76693658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85639667 - 2² = 85639663 is a prime.

It is not a weakly prime, because it can be changed into another prime (85639663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42819833 + 42819834.

It is an arithmetic number, because the mean of its divisors is an integer number (42819834).

Almost surely, 2^85639667 is an apocalyptic number.

85639667 is a deficient number, since it is larger than the sum of its proper divisors (1).

85639667 is an equidigital number, since it uses as much as digits as its factorization.

85639667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 85639667 is about 9254.1702491363. The cubic root of 85639667 is about 440.7831558540.

The spelling of 85639667 in words is "eighty-five million, six hundred thirty-nine thousand, six hundred sixty-seven".