81205914 has 32 divisors (see below), whose sum is σ = 165179520. Its totient is φ = 26611200.

The previous prime is 81205903. The next prime is 81205933. The reversal of 81205914 is 41950218.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128379 + ... + 129009.

It is an arithmetic number, because the mean of its divisors is an integer number (5161860).

Almost surely, 2^81205914 is an apocalyptic number.

81205914 is an abundant number, since it is smaller than the sum of its proper divisors (83973606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81205914 is a wasteful number, since it uses less digits than its factorization.

81205914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 81205914 is about 9011.4324055613. The cubic root of 81205914 is about 433.0412020523.

The spelling of 81205914 in words is "eighty-one million, two hundred five thousand, nine hundred fourteen".