78553859 has 2 divisors, whose sum is σ = 78553860. Its totient is φ = 78553858.

The previous prime is 78553841. The next prime is 78553883. The reversal of 78553859 is 95835587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78553859 - 2¹⁶ = 78488323 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78553829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39276929 + 39276930.

It is an arithmetic number, because the mean of its divisors is an integer number (39276930).

Almost surely, 2^78553859 is an apocalyptic number.

78553859 is a deficient number, since it is larger than the sum of its proper divisors (1).

78553859 is an equidigital number, since it uses as much as digits as its factorization.

78553859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512000, while the sum is 50.

The square root of 78553859 is about 8863.0614913810. The cubic root of 78553859 is about 428.2747875119.

The spelling of 78553859 in words is "seventy-eight million, five hundred fifty-three thousand, eight hundred fifty-nine".