81990114 has 8 divisors (see below), whose sum is σ = 163980240. Its totient is φ = 27330036.

The previous prime is 81990107. The next prime is 81990143. The reversal of 81990114 is 41109918.

It is a sphenic number, since it is the product of 3 distinct primes.

81990114 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6832504 + ... + 6832515.

It is an arithmetic number, because the mean of its divisors is an integer number (20497530).

Almost surely, 2^81990114 is an apocalyptic number.

81990114 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81990114 is a wasteful number, since it uses less digits than its factorization.

81990114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13665024.

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 81990114 is about 9054.8392586506. The cubic root of 81990114 is about 434.4306887110.

The spelling of 81990114 in words is "eighty-one million, nine hundred ninety thousand, one hundred fourteen".