81280194 has 16 divisors (see below), whose sum is σ = 166954368. Its totient is φ = 26361072.

The previous prime is 81280193. The next prime is 81280201. The reversal of 81280194 is 49108218.

It is not an unprimeable number, because it can be changed into a prime (81280193) 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, 182842 + ... + 183285.

It is an arithmetic number, because the mean of its divisors is an integer number (10434648).

Almost surely, 2^81280194 is an apocalyptic number.

81280194 is an abundant number, since it is smaller than the sum of its proper divisors (85674174).

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

81280194 is a wasteful number, since it uses less digits than its factorization.

81280194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366169.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 81280194 is about 9015.5528948590. The cubic root of 81280194 is about 433.1731977664.

The spelling of 81280194 in words is "eighty-one million, two hundred eighty thousand, one hundred ninety-four".