81074480 has 20 divisors (see below), whose sum is σ = 188498352. Its totient is φ = 32429760.

The previous prime is 81074453. The next prime is 81074491. The reversal of 81074480 is 8447018.

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

It is an unprimeable number.

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, 506636 + ... + 506795.

Almost surely, 2^81074480 is an apocalyptic number.

81074480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81074480 is an abundant number, since it is smaller than the sum of its proper divisors (107423872).

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

81074480 is a wasteful number, since it uses less digits than its factorization.

81074480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013444 (or 1013438 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 81074480 is about 9004.1368270368. The cubic root of 81074480 is about 432.8074462042.

The spelling of 81074480 in words is "eighty-one million, seventy-four thousand, four hundred eighty".