78061 has 4 divisors (see below), whose sum is σ = 78624. Its totient is φ = 77500.

The previous prime is 78059. The next prime is 78079. The reversal of 78061 is 16087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 78061 - 2¹ = 78059 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96 + ... + 406.

It is an arithmetic number, because the mean of its divisors is an integer number (19656).

2⁷⁸⁰⁶¹ is an apocalyptic number.

It is an amenable number.

78061 is a deficient number, since it is larger than the sum of its proper divisors (563).

78061 is a wasteful number, since it uses less digits than its factorization.

78061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 78061 is about 279.3939870505. The cubic root of 78061 is about 42.7377220420.

It can be divided in two parts, 780 and 61, that added together give a square (841 = 29²).

The spelling of 78061 in words is "seventy-eight thousand, sixty-one".