71778313 has 2 divisors, whose sum is σ = 71778314. Its totient is φ = 71778312.

The previous prime is 71778307. The next prime is 71778319. The reversal of 71778313 is 31387717.

It is a balanced prime because it is at equal distance from previous prime (71778307) and next prime (71778319).

It can be written as a sum of positive squares in only one way, i.e., 71707024 + 71289 = 8468^2 + 267^2 .

It is a cyclic number.

It is not a de Polignac number, because 71778313 - 2¹⁷ = 71647241 is a prime.

It is not a weakly prime, because it can be changed into another prime (71778319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35889156 + 35889157.

It is an arithmetic number, because the mean of its divisors is an integer number (35889157).

Almost surely, 2^71778313 is an apocalyptic number.

It is an amenable number.

71778313 is a deficient number, since it is larger than the sum of its proper divisors (1).

71778313 is an equidigital number, since it uses as much as digits as its factorization.

71778313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 37.

The square root of 71778313 is about 8472.2082717554. The cubic root of 71778313 is about 415.5893557010.

The spelling of 71778313 in words is "seventy-one million, seven hundred seventy-eight thousand, three hundred thirteen".