81292448 has 12 divisors (see below), whose sum is σ = 160044570. Its totient is φ = 40646208.

The previous prime is 81292439. The next prime is 81292483. The reversal of 81292448 is 84429218.

It can be written as a sum of positive squares in only one way, i.e., 80496784 + 795664 = 8972^2 + 892^2 .

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 as a sum of consecutive naturals, namely, 1270163 + ... + 1270226.

Almost surely, 2^81292448 is an apocalyptic number.

It is an amenable number.

81292448 is a deficient number, since it is larger than the sum of its proper divisors (78752122).

81292448 is a wasteful number, since it uses less digits than its factorization.

81292448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540399 (or 2540391 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 81292448 is about 9016.2324726018. The cubic root of 81292448 is about 433.1949654213.

The spelling of 81292448 in words is "eighty-one million, two hundred ninety-two thousand, four hundred forty-eight".