78340541 has 2 divisors, whose sum is σ = 78340542. Its totient is φ = 78340540.

The previous prime is 78340517. The next prime is 78340597. The reversal of 78340541 is 14504387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74459641 + 3880900 = 8629^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 78340541 - 2¹⁸ = 78078397 is a prime.

It is a super-2 number, since 2×78340541² = 12274480728345362, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78340498 and 78340507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78340501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39170270 + 39170271.

It is an arithmetic number, because the mean of its divisors is an integer number (39170271).

Almost surely, 2^78340541 is an apocalyptic number.

It is an amenable number.

78340541 is a deficient number, since it is larger than the sum of its proper divisors (1).

78340541 is an equidigital number, since it uses as much as digits as its factorization.

78340541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 78340541 is about 8851.0192068484. The cubic root of 78340541 is about 427.8867669272.

The spelling of 78340541 in words is "seventy-eight million, three hundred forty thousand, five hundred forty-one".