81003476 has 6 divisors (see below), whose sum is σ = 141756090. Its totient is φ = 40501736.

The previous prime is 81003463. The next prime is 81003509. The reversal of 81003476 is 67430018.

It can be written as a sum of positive squares in only one way, i.e., 78783376 + 2220100 = 8876^2 + 1490^2 .

It is a congruent number.

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, 10125431 + ... + 10125438.

It is an arithmetic number, because the mean of its divisors is an integer number (23626015).

Almost surely, 2^81003476 is an apocalyptic number.

It is an amenable number.

81003476 is a deficient number, since it is larger than the sum of its proper divisors (60752614).

81003476 is a wasteful number, since it uses less digits than its factorization.

81003476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20250873 (or 20250871 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 81003476 is about 9000.1931090394. The cubic root of 81003476 is about 432.6810602130.

The spelling of 81003476 in words is "eighty-one million, three thousand, four hundred seventy-six".