81330296 has 16 divisors (see below), whose sum is σ = 152708640. Its totient is φ = 40608000.

The previous prime is 81330269. The next prime is 81330299. The reversal of 81330296 is 69203318.

It is a super-2 number, since 2×81330296² = 13229234094895232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81330299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761 + ... + 12776.

It is an arithmetic number, because the mean of its divisors is an integer number (9544290).

Almost surely, 2^81330296 is an apocalyptic number.

It is an amenable number.

81330296 is a deficient number, since it is larger than the sum of its proper divisors (71378344).

81330296 is a wasteful number, since it uses less digits than its factorization.

81330296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14294 (or 14290 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 81330296 is about 9018.3311094681. The cubic root of 81330296 is about 433.2621837162.

The spelling of 81330296 in words is "eighty-one million, three hundred thirty thousand, two hundred ninety-six".