81480040 has 32 divisors (see below), whose sum is σ = 186072480. Its totient is φ = 32104512.

The previous prime is 81480029. The next prime is 81480041. The reversal of 81480040 is 4008418.

It is a junction number, because it is equal to n+sod(n) for n = 81479987 and 81480014.

It is not an unprimeable number, because it can be changed into a prime (81480041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12522 + ... + 17881.

It is an arithmetic number, because the mean of its divisors is an integer number (5814765).

Almost surely, 2^81480040 is an apocalyptic number.

It is an amenable number.

81480040 is an abundant number, since it is smaller than the sum of its proper divisors (104592440).

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

81480040 is a wasteful number, since it uses less digits than its factorization.

81480040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30481 (or 30477 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 81480040 is about 9026.6294927841. The cubic root of 81480040 is about 433.5279257526.

Adding to 81480040 its reverse (4008418), we get a palindrome (85488458).

The spelling of 81480040 in words is "eighty-one million, four hundred eighty thousand, forty".