81047350 has 24 divisors (see below), whose sum is σ = 158684040. Its totient is φ = 30712320.

The previous prime is 81047341. The next prime is 81047357. The reversal of 81047350 is 5374018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81047357) 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, 41707 + ... + 43606.

It is an arithmetic number, because the mean of its divisors is an integer number (6611835).

Almost surely, 2^81047350 is an apocalyptic number.

81047350 is a deficient number, since it is larger than the sum of its proper divisors (77636690).

81047350 is a wasteful number, since it uses less digits than its factorization.

81047350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85344 (or 85339 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 81047350 is about 9002.6301712333. The cubic root of 81047350 is about 432.7591639498.

The spelling of 81047350 in words is "eighty-one million, forty-seven thousand, three hundred fifty".