81041480 has 32 divisors (see below), whose sum is σ = 196371000. Its totient is φ = 29922816.

The previous prime is 81041473. The next prime is 81041539. The reversal of 81041480 is 8414018.

It can be written as a sum of positive squares in 4 ways, for example, as 59567524 + 21473956 = 7718^2 + 4634^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 77405 + ... + 78444.

Almost surely, 2^81041480 is an apocalyptic number.

It is an amenable number.

81041480 is an abundant number, since it is smaller than the sum of its proper divisors (115329520).

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

81041480 is a wasteful number, since it uses less digits than its factorization.

81041480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155873 (or 155869 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 81041480 is about 9002.3041494942. The cubic root of 81041480 is about 432.7487159108.

Adding to 81041480 its reverse (8414018), we get a palindrome (89455498).

The spelling of 81041480 in words is "eighty-one million, forty-one thousand, four hundred eighty".