81678835 has 12 divisors (see below), whose sum is σ = 114017328. Its totient is φ = 56008176.

The previous prime is 81678799. The next prime is 81678841. The reversal of 81678835 is 53887618.

It is not a de Polignac number, because 81678835 - 2⁹ = 81678323 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166447 + ... + 166936.

It is an arithmetic number, because the mean of its divisors is an integer number (9501444).

Almost surely, 2^81678835 is an apocalyptic number.

81678835 is a deficient number, since it is larger than the sum of its proper divisors (32338493).

81678835 is a wasteful number, since it uses less digits than its factorization.

81678835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333402 (or 333395 counting only the distinct ones).

The product of its digits is 322560, while the sum is 46.

The square root of 81678835 is about 9037.6343696788. The cubic root of 81678835 is about 433.8802132124.

The spelling of 81678835 in words is "eighty-one million, six hundred seventy-eight thousand, eight hundred thirty-five".