78641461 has 4 divisors (see below), whose sum is σ = 78979212. Its totient is φ = 78303712.

The previous prime is 78641449. The next prime is 78641477. The reversal of 78641461 is 16414687.

It is a happy number.

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 39816100 + 38825361 = 6310^2 + 6231^2 .

It is a cyclic number.

It is not a de Polignac number, because 78641461 - 2¹⁵ = 78608693 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 78641461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78641411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168526 + ... + 168991.

It is an arithmetic number, because the mean of its divisors is an integer number (19744803).

Almost surely, 2^78641461 is an apocalyptic number.

It is an amenable number.

78641461 is a deficient number, since it is larger than the sum of its proper divisors (337751).

78641461 is a wasteful number, since it uses less digits than its factorization.

78641461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337750.

The product of its digits is 32256, while the sum is 37.

The square root of 78641461 is about 8868.0020861522. The cubic root of 78641461 is about 428.4339300869.

Subtracting from 78641461 its sum of digits (37), we obtain a square (78641424 = 8868²).

It can be divided in two parts, 7 and 8641461, that added together give a palindrome (8641468).

The spelling of 78641461 in words is "seventy-eight million, six hundred forty-one thousand, four hundred sixty-one".