78775133 has 2 divisors, whose sum is σ = 78775134. Its totient is φ = 78775132.

The previous prime is 78775009. The next prime is 78775141. The reversal of 78775133 is 33157787.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53904964 + 24870169 = 7342^2 + 4987^2 .

It is a cyclic number.

It is not a de Polignac number, because 78775133 - 2¹⁰ = 78774109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78775153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39387566 + 39387567.

It is an arithmetic number, because the mean of its divisors is an integer number (39387567).

Almost surely, 2^78775133 is an apocalyptic number.

It is an amenable number.

78775133 is a deficient number, since it is larger than the sum of its proper divisors (1).

78775133 is an equidigital number, since it uses as much as digits as its factorization.

78775133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 123480, while the sum is 41.

The square root of 78775133 is about 8875.5356458075. The cubic root of 78775133 is about 428.6765383408.

The spelling of 78775133 in words is "seventy-eight million, seven hundred seventy-five thousand, one hundred thirty-three".