78936461 has 2 divisors, whose sum is σ = 78936462. Its totient is φ = 78936460.

The previous prime is 78936427. The next prime is 78936467. The reversal of 78936461 is 16463987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73788100 + 5148361 = 8590^2 + 2269^2 .

It is a cyclic number.

It is not a de Polignac number, because 78936461 - 2⁶ = 78936397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78936467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39468230 + 39468231.

It is an arithmetic number, because the mean of its divisors is an integer number (39468231).

Almost surely, 2^78936461 is an apocalyptic number.

It is an amenable number.

78936461 is a deficient number, since it is larger than the sum of its proper divisors (1).

78936461 is an equidigital number, since it uses as much as digits as its factorization.

78936461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 78936461 is about 8884.6193503155. The cubic root of 78936461 is about 428.9689756835.

It can be divided in two parts, 78936 and 461, that added together give a palindrome (79397).

The spelling of 78936461 in words is "seventy-eight million, nine hundred thirty-six thousand, four hundred sixty-one".