85415815 has 8 divisors (see below), whose sum is σ = 102566448. Its totient is φ = 68287680.

The previous prime is 85415797. The next prime is 85415831. The reversal of 85415815 is 51851458.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 85415815 - 2⁵ = 85415783 is a prime.

It is a super-2 number, since 2×85415815² = 14591722904228450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4339 + ... + 13771.

It is an arithmetic number, because the mean of its divisors is an integer number (12820806).

Almost surely, 2^85415815 is an apocalyptic number.

85415815 is a deficient number, since it is larger than the sum of its proper divisors (17150633).

85415815 is a wasteful number, since it uses less digits than its factorization.

85415815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11249.

The product of its digits is 32000, while the sum is 37.

The square root of 85415815 is about 9242.0676799080. The cubic root of 85415815 is about 440.3987689988.

The spelling of 85415815 in words is "eighty-five million, four hundred fifteen thousand, eight hundred fifteen".