81359878 has 16 divisors (see below), whose sum is σ = 127593216. Its totient is φ = 38835720.

The previous prime is 81359869. The next prime is 81359899. The reversal of 81359878 is 87895318.

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, 27625 + ... + 30427.

It is an arithmetic number, because the mean of its divisors is an integer number (7974576).

Almost surely, 2^81359878 is an apocalyptic number.

81359878 is a deficient number, since it is larger than the sum of its proper divisors (46233338).

81359878 is a wasteful number, since it uses less digits than its factorization.

81359878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3459.

The product of its digits is 483840, while the sum is 49.

The square root of 81359878 is about 9019.9710642551. The cubic root of 81359878 is about 433.3147070232.

The spelling of 81359878 in words is "eighty-one million, three hundred fifty-nine thousand, eight hundred seventy-eight".