81140480 has 36 divisors (see below), whose sum is σ = 194359872. Its totient is φ = 32455680.

The previous prime is 81140467. The next prime is 81140537. The reversal of 81140480 is 8404118.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30416 + ... + 32975.

Almost surely, 2^81140480 is an apocalyptic number.

81140480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81140480 is an abundant number, since it is smaller than the sum of its proper divisors (113219392).

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

81140480 is an equidigital number, since it uses as much as digits as its factorization.

81140480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63412 (or 63398 counting only the distinct ones).

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

The square root of 81140480 is about 9007.8010635227. The cubic root of 81140480 is about 432.9248589980.

Adding to 81140480 its reverse (8404118), we get a palindrome (89544598).

The spelling of 81140480 in words is "eighty-one million, one hundred forty thousand, four hundred eighty".