81375896 has 16 divisors (see below), whose sum is σ = 174377040. Its totient is φ = 34875360.

The previous prime is 81375893. The next prime is 81375907. The reversal of 81375896 is 69857318.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81375896.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81375893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726515 + ... + 726626.

It is an arithmetic number, because the mean of its divisors is an integer number (10898565).

Almost surely, 2^81375896 is an apocalyptic number.

It is an amenable number.

81375896 is an abundant number, since it is smaller than the sum of its proper divisors (93001144).

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

81375896 is a wasteful number, since it uses less digits than its factorization.

81375896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453154 (or 1453150 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

The square root of 81375896 is about 9020.8589391476. The cubic root of 81375896 is about 433.3431419213.

The spelling of 81375896 in words is "eighty-one million, three hundred seventy-five thousand, eight hundred ninety-six".