81578008 has 16 divisors (see below), whose sum is σ = 153064080. Its totient is φ = 40760928.

The previous prime is 81577999. The next prime is 81578027. The reversal of 81578008 is 80087518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13941 + ... + 18907.

It is an arithmetic number, because the mean of its divisors is an integer number (9566505).

Almost surely, 2^81578008 is an apocalyptic number.

It is an amenable number.

81578008 is a deficient number, since it is larger than the sum of its proper divisors (71486072).

81578008 is a wasteful number, since it uses less digits than its factorization.

81578008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7026 (or 7022 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 81578008 is about 9032.0544728207. The cubic root of 81578008 is about 433.7016077697.

The spelling of 81578008 in words is "eighty-one million, five hundred seventy-eight thousand, eight".