81788304 has 40 divisors (see below), whose sum is σ = 227540992. Its totient is φ = 25165440.

The previous prime is 81788297. The next prime is 81788321. The reversal of 81788304 is 40388718.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64912 + ... + 66159.

Almost surely, 2^81788304 is an apocalyptic number.

It is an amenable number.

81788304 is an abundant number, since it is smaller than the sum of its proper divisors (145752688).

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

81788304 is a wasteful number, since it uses less digits than its factorization.

81788304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131095 (or 131089 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 81788304 is about 9043.6886279880. The cubic root of 81788304 is about 434.0739607930.

The spelling of 81788304 in words is "eighty-one million, seven hundred eighty-eight thousand, three hundred four".