81230447 has 12 divisors (see below), whose sum is σ = 84579768. Its totient is φ = 78008400.

The previous prime is 81230431. The next prime is 81230449. The reversal of 81230447 is 74403218.

It is not a de Polignac number, because 81230447 - 2⁴ = 81230431 is a prime.

It is a super-3 number, since 3×81230447³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81230449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173708 + ... + 174174.

It is an arithmetic number, because the mean of its divisors is an integer number (7048314).

Almost surely, 2^81230447 is an apocalyptic number.

81230447 is a deficient number, since it is larger than the sum of its proper divisors (3349321).

81230447 is a wasteful number, since it uses less digits than its factorization.

81230447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710 (or 679 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 81230447 is about 9012.7935181052. The cubic root of 81230447 is about 433.0848061431.

The spelling of 81230447 in words is "eighty-one million, two hundred thirty thousand, four hundred forty-seven".