80778539 has 2 divisors, whose sum is σ = 80778540. Its totient is φ = 80778538.

The previous prime is 80778521. The next prime is 80778559. The reversal of 80778539 is 93587708.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80778539 - 2¹² = 80774443 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 80778493 and 80778502.

It is not a weakly prime, because it can be changed into another prime (80778559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40389269 + 40389270.

It is an arithmetic number, because the mean of its divisors is an integer number (40389270).

Almost surely, 2^80778539 is an apocalyptic number.

80778539 is a deficient number, since it is larger than the sum of its proper divisors (1).

80778539 is an equidigital number, since it uses as much as digits as its factorization.

80778539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 80778539 is about 8987.6881899630. The cubic root of 80778539 is about 432.2801876775.

The spelling of 80778539 in words is "eighty million, seven hundred seventy-eight thousand, five hundred thirty-nine".