81844604 has 6 divisors (see below), whose sum is σ = 143228064. Its totient is φ = 40922300.

The previous prime is 81844601. The next prime is 81844673. The reversal of 81844604 is 40644818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81844601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10230572 + ... + 10230579.

It is an arithmetic number, because the mean of its divisors is an integer number (23871344).

Almost surely, 2^81844604 is an apocalyptic number.

It is an amenable number.

81844604 is a deficient number, since it is larger than the sum of its proper divisors (61383460).

81844604 is a wasteful number, since it uses less digits than its factorization.

81844604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20461155 (or 20461153 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 81844604 is about 9046.8007604899. The cubic root of 81844604 is about 434.1735380246.

The spelling of 81844604 in words is "eighty-one million, eight hundred forty-four thousand, six hundred four".