81198404 has 12 divisors (see below), whose sum is σ = 162396864. Its totient is φ = 34799304.

The previous prime is 81198391. The next prime is 81198413. The reversal of 81198404 is 40489118.

81198404 is an admirable number.

It is a super-3 number, since 3×81198404³ (a number of 25 digits) contains 333 as substring.

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, 1449944 + ... + 1449999.

It is an arithmetic number, because the mean of its divisors is an integer number (13533072).

Almost surely, 2^81198404 is an apocalyptic number.

It is an amenable number.

81198404 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.

81198404 is a wasteful number, since it uses less digits than its factorization.

81198404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2899954 (or 2899952 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 81198404 is about 9011.0157030159. The cubic root of 81198404 is about 433.0278522869.

The spelling of 81198404 in words is "eighty-one million, one hundred ninety-eight thousand, four hundred four".