81255044 has 24 divisors (see below), whose sum is σ = 159794880. Its totient is φ = 35871264.

The previous prime is 81255043. The next prime is 81255047. The reversal of 81255044 is 44055218.

It is a junction number, because it is equal to n+sod(n) for n = 81254998 and 81255016.

It is not an unprimeable number, because it can be changed into a prime (81255043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32774 + ... + 35165.

It is an arithmetic number, because the mean of its divisors is an integer number (6658120).

Almost surely, 2^81255044 is an apocalyptic number.

It is an amenable number.

81255044 is a deficient number, since it is larger than the sum of its proper divisors (78539836).

81255044 is a wasteful number, since it uses less digits than its factorization.

81255044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67979 (or 67977 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 81255044 is about 9014.1579750967. The cubic root of 81255044 is about 433.1285151723.

The spelling of 81255044 in words is "eighty-one million, two hundred fifty-five thousand, forty-four".