78747133 has 2 divisors, whose sum is σ = 78747134. Its totient is φ = 78747132.

The previous prime is 78747131. The next prime is 78747143. The reversal of 78747133 is 33174787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57198969 + 21548164 = 7563^2 + 4642^2 .

It is an emirp because it is prime and its reverse (33174787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78747133 - 2¹ = 78747131 is a prime.

It is a super-2 number, since 2×78747133² = 12402221911439378, which contains 22 as substring.

Together with 78747131, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78747131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39373566 + 39373567.

It is an arithmetic number, because the mean of its divisors is an integer number (39373567).

Almost surely, 2^78747133 is an apocalyptic number.

It is an amenable number.

78747133 is a deficient number, since it is larger than the sum of its proper divisors (1).

78747133 is an equidigital number, since it uses as much as digits as its factorization.

78747133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 40.

The square root of 78747133 is about 8873.9581360293. The cubic root of 78747133 is about 428.6257424233.

The spelling of 78747133 in words is "seventy-eight million, seven hundred forty-seven thousand, one hundred thirty-three".