81475286448 has 40 divisors (see below), whose sum is σ = 211351205296. Its totient is φ = 27045734400.

The previous prime is 81475286401. The next prime is 81475286461. The reversal of 81475286448 is 84468257418.

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, 3510013 + ... + 3533148.

Almost surely, 2^81475286448 is an apocalyptic number.

It is an amenable number.

81475286448 is an abundant number, since it is smaller than the sum of its proper divisors (129875918848).

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

81475286448 is a wasteful number, since it uses less digits than its factorization.

81475286448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7043413 (or 7043407 counting only the distinct ones).

The product of its digits is 13762560, while the sum is 57.

The spelling of 81475286448 in words is "eighty-one billion, four hundred seventy-five million, two hundred eighty-six thousand, four hundred forty-eight".