85161040 has 80 divisors (see below), whose sum is σ = 210254400. Its totient is φ = 31988736.

The previous prime is 85161031. The next prime is 85161049. The reversal of 85161040 is 4016158.

It is an interprime number because it is at equal distance from previous prime (85161031) and next prime (85161049).

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 85160996 and 85161014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85161049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 271924 + ... + 272236.

It is an arithmetic number, because the mean of its divisors is an integer number (2628180).

Almost surely, 2^85161040 is an apocalyptic number.

85161040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 85161040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105127200).

85161040 is an abundant number, since it is smaller than the sum of its proper divisors (125093360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85161040 is a wasteful number, since it uses less digits than its factorization.

85161040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524 (or 518 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 85161040 is about 9228.2739447851. The cubic root of 85161040 is about 439.9604647673.

Adding to 85161040 its reverse (4016158), we get a palindrome (89177198).

The spelling of 85161040 in words is "eighty-five million, one hundred sixty-one thousand, forty".