80778239 has 2 divisors, whose sum is σ = 80778240. Its totient is φ = 80778238.

The previous prime is 80778197. The next prime is 80778251. The reversal of 80778239 is 93287708.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 80778239 - 2²⁴ = 64001023 is a prime.

It is a super-2 number, since 2×80778239² = 13050247791882242, which contains 22 as substring.

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 80778239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80778539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40389119 + 40389120.

It is an arithmetic number, because the mean of its divisors is an integer number (40389120).

Almost surely, 2^80778239 is an apocalyptic number.

80778239 is a deficient number, since it is larger than the sum of its proper divisors (1).

80778239 is an equidigital number, since it uses as much as digits as its factorization.

80778239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 80778239 is about 8987.6715004499. The cubic root of 80778239 is about 432.2796525344.

The spelling of 80778239 in words is "eighty million, seven hundred seventy-eight thousand, two hundred thirty-nine".