85405015 has 4 divisors (see below), whose sum is σ = 102486024. Its totient is φ = 68324008.

The previous prime is 85405013. The next prime is 85405027. The reversal of 85405015 is 51050458.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85405015 - 2¹ = 85405013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85405013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8540497 + ... + 8540506.

It is an arithmetic number, because the mean of its divisors is an integer number (25621506).

Almost surely, 2^85405015 is an apocalyptic number.

85405015 is a deficient number, since it is larger than the sum of its proper divisors (17081009).

85405015 is a wasteful number, since it uses less digits than its factorization.

85405015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17081008.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 85405015 is about 9241.4833766014. The cubic root of 85405015 is about 440.3802068345.

The spelling of 85405015 in words is "eighty-five million, four hundred five thousand, fifteen".