81903804 has 24 divisors (see below), whose sum is σ = 192487680. Its totient is φ = 27104304.

The previous prime is 81903769. The next prime is 81903827. The reversal of 81903804 is 40830918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22884 + ... + 26219.

It is an arithmetic number, because the mean of its divisors is an integer number (8020320).

Almost surely, 2^81903804 is an apocalyptic number.

It is an amenable number.

81903804 is an abundant number, since it is smaller than the sum of its proper divisors (110583876).

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

81903804 is a wasteful number, since it uses less digits than its factorization.

81903804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49249 (or 49247 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81903804 is about 9050.0720439121. The cubic root of 81903804 is about 434.2781952143.

The spelling of 81903804 in words is "eighty-one million, nine hundred three thousand, eight hundred four".