80999994 has 8 divisors (see below), whose sum is σ = 162000000. Its totient is φ = 26999996.

The previous prime is 80999957. The next prime is 81000001. The reversal of 80999994 is 49999908.

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

80999994 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, 6749994 + ... + 6750005.

It is an arithmetic number, because the mean of its divisors is an integer number (20250000).

Almost surely, 2^80999994 is an apocalyptic number.

80999994 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.

80999994 is a wasteful number, since it uses less digits than its factorization.

80999994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13500004.

The product of its (nonzero) digits is 1889568, while the sum is 57.

The square root of 80999994 is about 8999.9996666667. Note that the first 3 decimals coincide. The cubic root of 80999994 is about 432.6748604089.

The spelling of 80999994 in words is "eighty million, nine hundred ninety-nine thousand, nine hundred ninety-four".