85220405 has 16 divisors (see below), whose sum is σ = 112990464. Its totient is φ = 61374720.

The previous prime is 85220393. The next prime is 85220413. The reversal of 85220405 is 50402258.

It is not a de Polignac number, because 85220405 - 2⁴ = 85220389 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 19841 + ... + 23750.

It is an arithmetic number, because the mean of its divisors is an integer number (7061904).

Almost surely, 2^85220405 is an apocalyptic number.

85220405 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

85220405 is a deficient number, since it is larger than the sum of its proper divisors (27770059).

85220405 is a wasteful number, since it uses less digits than its factorization.

85220405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43636.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 85220405 is about 9231.4898580890. The cubic root of 85220405 is about 440.0626718580.

The spelling of 85220405 in words is "eighty-five million, two hundred twenty thousand, four hundred five".