78081 has 8 divisors (see below), whose sum is σ = 110304. Its totient is φ = 48960.

The previous prime is 78079. The next prime is 78101. The reversal of 78081 is 18087.

78081 = T₈₄ + T₈₅ + ... + T₁₀₁.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78081 - 2¹ = 78079 is a prime.

It is a super-2 number, since 2×78081² = 12193285122, which contains 22 as substring.

78081 is a modest number, since divided by 81 gives 78 as remainder.

It is a nialpdrome in base 5.

It is not an unprimeable number, because it can be changed into a prime (78031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 715 + ... + 816.

It is an arithmetic number, because the mean of its divisors is an integer number (13788).

2⁷⁸⁰⁸¹ is an apocalyptic number.

It is an amenable number.

78081 is a deficient number, since it is larger than the sum of its proper divisors (32223).

78081 is a wasteful number, since it uses less digits than its factorization.

78081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 78081 is about 279.4297765092. The cubic root of 78081 is about 42.7413716727.

It can be divided in two parts, 780 and 81, that added together give a triangular number (861 = T₄₁).

The spelling of 78081 in words is "seventy-eight thousand, eighty-one".