81448476 has 24 divisors (see below), whose sum is σ = 190270080. Its totient is φ = 27117552.

The previous prime is 81448469. The next prime is 81448531. The reversal of 81448476 is 67484418.

It is a happy number.

It is a congruent number.

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, 8095 + ... + 15113.

It is an arithmetic number, because the mean of its divisors is an integer number (7927920).

Almost surely, 2^81448476 is an apocalyptic number.

It is an amenable number.

81448476 is an abundant number, since it is smaller than the sum of its proper divisors (108821604).

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

81448476 is a wasteful number, since it uses less digits than its factorization.

81448476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7993 (or 7991 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 81448476 is about 9024.8809410429. The cubic root of 81448476 is about 433.4719380416.

The spelling of 81448476 in words is "eighty-one million, four hundred forty-eight thousand, four hundred seventy-six".