81035870224 has 15 divisors (see below), whose sum is σ = 157009204767. Its totient is φ = 40517365776.

The previous prime is 81035870221. The next prime is 81035870233. The reversal of 81035870224 is 42207853018.

It is a happy number.

The square root of 81035870224 is 284668.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81035870221) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1103089 + ... + 1174255.

Almost surely, 2^81035870224 is an apocalyptic number.

81035870224 is the 284668-th square number.

It is an amenable number.

81035870224 is a deficient number, since it is larger than the sum of its proper divisors (75973334543).

81035870224 is an frugal number, since it uses more digits than its factorization.

81035870224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142342 (or 71169 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The spelling of 81035870224 in words is "eighty-one billion, thirty-five million, eight hundred seventy thousand, two hundred twenty-four".