85280639 has 2 divisors, whose sum is σ = 85280640. Its totient is φ = 85280638.

The previous prime is 85280621. The next prime is 85280669. The reversal of 85280639 is 93608258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85280639 - 2¹⁶ = 85215103 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 85280596 and 85280605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85280669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42640319 + 42640320.

It is an arithmetic number, because the mean of its divisors is an integer number (42640320).

Almost surely, 2^85280639 is an apocalyptic number.

85280639 is a deficient number, since it is larger than the sum of its proper divisors (1).

85280639 is an equidigital number, since it uses as much as digits as its factorization.

85280639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 85280639 is about 9234.7517021304. The cubic root of 85280639 is about 440.1663265810.

The spelling of 85280639 in words is "eighty-five million, two hundred eighty thousand, six hundred thirty-nine".