78789313 has 2 divisors, whose sum is σ = 78789314. Its totient is φ = 78789312.

The previous prime is 78789301. The next prime is 78789379. The reversal of 78789313 is 31398787.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42211009 + 36578304 = 6497^2 + 6048^2 .

It is a cyclic number.

It is not a de Polignac number, because 78789313 - 2⁵ = 78789281 is a prime.

It is not a weakly prime, because it can be changed into another prime (78789913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39394656 + 39394657.

It is an arithmetic number, because the mean of its divisors is an integer number (39394657).

Almost surely, 2^78789313 is an apocalyptic number.

It is an amenable number.

78789313 is a deficient number, since it is larger than the sum of its proper divisors (1).

78789313 is an equidigital number, since it uses as much as digits as its factorization.

78789313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 46.

The square root of 78789313 is about 8876.3344348892. The cubic root of 78789313 is about 428.7022582534.

It can be divided in two parts, 787 and 89313, that added together give a triangular number (90100 = T₄₂₄).

The spelling of 78789313 in words is "seventy-eight million, seven hundred eighty-nine thousand, three hundred thirteen".