81804898 has 16 divisors (see below), whose sum is σ = 140860224. Its totient is φ = 34903440.

The previous prime is 81804893. The next prime is 81804949. The reversal of 81804898 is 89840818.

It is not an unprimeable number, because it can be changed into a prime (81804893) 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, 9693 + ... + 16048.

It is an arithmetic number, because the mean of its divisors is an integer number (8803764).

Almost surely, 2^81804898 is an apocalyptic number.

81804898 is a deficient number, since it is larger than the sum of its proper divisors (59055326).

81804898 is a wasteful number, since it uses less digits than its factorization.

81804898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25977.

The product of its (nonzero) digits is 147456, while the sum is 46.

The square root of 81804898 is about 9044.6060168478. The cubic root of 81804898 is about 434.1033151786.

The spelling of 81804898 in words is "eighty-one million, eight hundred four thousand, eight hundred ninety-eight".