78580417 has 2 divisors, whose sum is σ = 78580418. Its totient is φ = 78580416.

The previous prime is 78580391. The next prime is 78580483. The reversal of 78580417 is 71408587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78074896 + 505521 = 8836^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 78580417 - 2⁷ = 78580289 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78580417.

It is not a weakly prime, because it can be changed into another prime (78580487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39290208 + 39290209.

It is an arithmetic number, because the mean of its divisors is an integer number (39290209).

Almost surely, 2^78580417 is an apocalyptic number.

It is an amenable number.

78580417 is a deficient number, since it is larger than the sum of its proper divisors (1).

78580417 is an equidigital number, since it uses as much as digits as its factorization.

78580417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 78580417 is about 8864.5596055303. The cubic root of 78580417 is about 428.3230467164.

The spelling of 78580417 in words is "seventy-eight million, five hundred eighty thousand, four hundred seventeen".