81204914 has 16 divisors (see below), whose sum is σ = 139330368. Its totient is φ = 34771632.

The previous prime is 81204911. The next prime is 81204923. The reversal of 81204914 is 41940218.

It is not an unprimeable number, because it can be changed into a prime (81204911) 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, 22589 + ... + 25935.

It is an arithmetic number, because the mean of its divisors is an integer number (8708148).

Almost surely, 2^81204914 is an apocalyptic number.

81204914 is a deficient number, since it is larger than the sum of its proper divisors (58125454).

81204914 is a wasteful number, since it uses less digits than its factorization.

81204914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5089.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 81204914 is about 9011.3769203158. The cubic root of 81204914 is about 433.0394245012.

The spelling of 81204914 in words is "eighty-one million, two hundred four thousand, nine hundred fourteen".