81158160 has 40 divisors (see below), whose sum is σ = 251591040. Its totient is φ = 21642112.

The previous prime is 81158149. The next prime is 81158171. The reversal of 81158160 is 6185118.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81158149) and next prime (81158171).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 168840 + ... + 169319.

It is an arithmetic number, because the mean of its divisors is an integer number (6289776).

Almost surely, 2^81158160 is an apocalyptic number.

81158160 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81158160 is an abundant number, since it is smaller than the sum of its proper divisors (170432880).

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

81158160 is a wasteful number, since it uses less digits than its factorization.

81158160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338175 (or 338169 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 81158160 is about 9008.7823816540. The cubic root of 81158160 is about 432.9563005820.

It can be divided in two parts, 81158 and 160, that added together give a palindrome (81318).

The spelling of 81158160 in words is "eighty-one million, one hundred fifty-eight thousand, one hundred sixty".