81080958 has 64 divisors (see below), whose sum is σ = 190080000. Its totient is φ = 22581504.

The previous prime is 81080917. The next prime is 81080959. The reversal of 81080958 is 85908018.

It is a Curzon number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81080959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 407343 + ... + 407541.

It is an arithmetic number, because the mean of its divisors is an integer number (2970000).

Almost surely, 2^81080958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81080958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95040000).

81080958 is an abundant number, since it is smaller than the sum of its proper divisors (108999042).

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

81080958 is a wasteful number, since it uses less digits than its factorization.

81080958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409.

The product of its (nonzero) digits is 23040, while the sum is 39.

The square root of 81080958 is about 9004.4965433943. The cubic root of 81080958 is about 432.8189732674.

The spelling of 81080958 in words is "eighty-one million, eighty thousand, nine hundred fifty-eight".