78738773 has 2 divisors, whose sum is σ = 78738774. Its totient is φ = 78738772.

The previous prime is 78738767. The next prime is 78738823. The reversal of 78738773 is 37783787.

It is an a-pointer prime, because the next prime (78738823) can be obtained adding 78738773 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64915249 + 13823524 = 8057^2 + 3718^2 .

It is a cyclic number.

It is not a de Polignac number, because 78738773 - 2¹⁰ = 78737749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78738743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39369386 + 39369387.

It is an arithmetic number, because the mean of its divisors is an integer number (39369387).

Almost surely, 2^78738773 is an apocalyptic number.

It is an amenable number.

78738773 is a deficient number, since it is larger than the sum of its proper divisors (1).

78738773 is an equidigital number, since it uses as much as digits as its factorization.

78738773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382976, while the sum is 50.

The square root of 78738773 is about 8873.4870823144. The cubic root of 78738773 is about 428.6105738794.

The spelling of 78738773 in words is "seventy-eight million, seven hundred thirty-eight thousand, seven hundred seventy-three".