80778133 has 2 divisors, whose sum is σ = 80778134. Its totient is φ = 80778132.

The previous prime is 80778127. The next prime is 80778143. The reversal of 80778133 is 33187708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76422564 + 4355569 = 8742^2 + 2087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80778133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 80778092 and 80778101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80778143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40389066 + 40389067.

It is an arithmetic number, because the mean of its divisors is an integer number (40389067).

Almost surely, 2^80778133 is an apocalyptic number.

It is an amenable number.

80778133 is a deficient number, since it is larger than the sum of its proper divisors (1).

80778133 is an equidigital number, since it uses as much as digits as its factorization.

80778133 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 80778133 is about 8987.6656034813. The cubic root of 80778133 is about 432.2794634502.

The spelling of 80778133 in words is "eighty million, seven hundred seventy-eight thousand, one hundred thirty-three".