78635441 has 4 divisors (see below), whose sum is σ = 78766884. Its totient is φ = 78504000.

The previous prime is 78635423. The next prime is 78635461. The reversal of 78635441 is 14453687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14453687 = 29 ⋅498403.

It can be written as a sum of positive squares in 2 ways, for example, as 31080625 + 47554816 = 5575^2 + 6896^2 .

It is a cyclic number.

It is not a de Polignac number, because 78635441 - 2²⁶ = 11526577 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78635395 and 78635404.

It is not an unprimeable number, because it can be changed into a prime (78635461) 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, 64820 + ... + 66021.

It is an arithmetic number, because the mean of its divisors is an integer number (19691721).

Almost surely, 2^78635441 is an apocalyptic number.

It is an amenable number.

78635441 is a deficient number, since it is larger than the sum of its proper divisors (131443).

78635441 is a wasteful number, since it uses less digits than its factorization.

78635441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131442.

The product of its digits is 80640, while the sum is 38.

The square root of 78635441 is about 8867.6626570929. The cubic root of 78635441 is about 428.4229976091.

The spelling of 78635441 in words is "seventy-eight million, six hundred thirty-five thousand, four hundred forty-one".