78558241 has 4 divisors (see below), whose sum is σ = 83179332. Its totient is φ = 73937152.

The previous prime is 78558239. The next prime is 78558269. The reversal of 78558241 is 14285587.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34468641 + 44089600 = 5871^2 + 6640^2 .

It is a cyclic number.

It is not a de Polignac number, because 78558241 - 2¹ = 78558239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78558194 and 78558203.

It is not an unprimeable number, because it can be changed into a prime (78558841) 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, 2310520 + ... + 2310553.

It is an arithmetic number, because the mean of its divisors is an integer number (20794833).

Almost surely, 2^78558241 is an apocalyptic number.

It is an amenable number.

78558241 is a deficient number, since it is larger than the sum of its proper divisors (4621091).

78558241 is a wasteful number, since it uses less digits than its factorization.

78558241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4621090.

The product of its digits is 89600, while the sum is 40.

The square root of 78558241 is about 8863.3086937103. The cubic root of 78558241 is about 428.2827509027.

The spelling of 78558241 in words is "seventy-eight million, five hundred fifty-eight thousand, two hundred forty-one".