81190960 has 20 divisors (see below), whose sum is σ = 188769168. Its totient is φ = 32476352.

The previous prime is 81190957. The next prime is 81190961. The reversal of 81190960 is 6909118.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (81190961) 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 3 ways as a sum of consecutive naturals, for example, 507364 + ... + 507523.

Almost surely, 2^81190960 is an apocalyptic number.

81190960 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81190960 is an abundant number, since it is smaller than the sum of its proper divisors (107578208).

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

81190960 is a wasteful number, since it uses less digits than its factorization.

81190960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014900 (or 1014894 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 81190960 is about 9010.6026435528. The cubic root of 81190960 is about 433.0146190308.

The spelling of 81190960 in words is "eighty-one million, one hundred ninety thousand, nine hundred sixty".