81282904 has 16 divisors (see below), whose sum is σ = 152580600. Its totient is φ = 40594752.

The previous prime is 81282841. The next prime is 81282907. The reversal of 81282904 is 40928218.

It is a self number, because there is not a number n which added to its sum of digits gives 81282904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81282907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2212 + ... + 12940.

Almost surely, 2^81282904 is an apocalyptic number.

It is an amenable number.

81282904 is a deficient number, since it is larger than the sum of its proper divisors (71297696).

81282904 is a wasteful number, since it uses less digits than its factorization.

81282904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11682 (or 11678 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 81282904 is about 9015.7031894356. The cubic root of 81282904 is about 433.1780119213.

The spelling of 81282904 in words is "eighty-one million, two hundred eighty-two thousand, nine hundred four".