81804087 has 10 divisors (see below), whose sum is σ = 122201288. Its totient is φ = 54536004.

The previous prime is 81804059. The next prime is 81804113. The reversal of 81804087 is 78040818.

It is not a de Polignac number, because 81804087 - 2⁷ = 81803959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81804007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 504883 + ... + 505044.

Almost surely, 2^81804087 is an apocalyptic number.

81804087 is a deficient number, since it is larger than the sum of its proper divisors (40397201).

81804087 is a wasteful number, since it uses less digits than its factorization.

81804087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009939 (or 1009930 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 81804087 is about 9044.5611833853. The cubic root of 81804087 is about 434.1018806314.

The spelling of 81804087 in words is "eighty-one million, eight hundred four thousand, eighty-seven".