81093472 has 12 divisors (see below), whose sum is σ = 159652836. Its totient is φ = 40546720.

The previous prime is 81093457. The next prime is 81093473. The reversal of 81093472 is 27439018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81093473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1267054 + ... + 1267117.

It is an arithmetic number, because the mean of its divisors is an integer number (13304403).

Almost surely, 2^81093472 is an apocalyptic number.

It is an amenable number.

81093472 is a deficient number, since it is larger than the sum of its proper divisors (78559364).

81093472 is a wasteful number, since it uses less digits than its factorization.

81093472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2534181 (or 2534173 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 81093472 is about 9005.1913916363. The cubic root of 81093472 is about 432.8412391530.

The spelling of 81093472 in words is "eighty-one million, ninety-three thousand, four hundred seventy-two".