78461617 has 8 divisors (see below), whose sum is σ = 87411240. Its totient is φ = 69928320.

The previous prime is 78461611. The next prime is 78461639. The reversal of 78461617 is 71616487.

It can be written as a sum of positive squares in 4 ways, for example, as 156816 + 78304801 = 396^2 + 8849^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78461617 - 2¹⁹ = 77937329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78461617.

It is not an unprimeable number, because it can be changed into a prime (78461611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103684 + ... + 104437.

It is an arithmetic number, because the mean of its divisors is an integer number (10926405).

Almost surely, 2^78461617 is an apocalyptic number.

It is an amenable number.

78461617 is a deficient number, since it is larger than the sum of its proper divisors (8949623).

78461617 is a wasteful number, since it uses less digits than its factorization.

78461617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208163.

The product of its digits is 56448, while the sum is 40.

The square root of 78461617 is about 8857.8562304883. The cubic root of 78461617 is about 428.1070877263.

The spelling of 78461617 in words is "seventy-eight million, four hundred sixty-one thousand, six hundred seventeen".