81230944 has 12 divisors (see below), whose sum is σ = 159923484. Its totient is φ = 40615456.

The previous prime is 81230921. The next prime is 81230957. The reversal of 81230944 is 44903218.

It is a super-2 number, since 2×81230944² = 13196932526262272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269202 + ... + 1269265.

It is an arithmetic number, because the mean of its divisors is an integer number (13326957).

Almost surely, 2^81230944 is an apocalyptic number.

It is an amenable number.

81230944 is a deficient number, since it is larger than the sum of its proper divisors (78692540).

81230944 is a wasteful number, since it uses less digits than its factorization.

81230944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538477 (or 2538469 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 81230944 is about 9012.8210899807. The cubic root of 81230944 is about 433.0856894026.

The spelling of 81230944 in words is "eighty-one million, two hundred thirty thousand, nine hundred forty-four".