78750313 has 2 divisors, whose sum is σ = 78750314. Its totient is φ = 78750312.

The previous prime is 78750293. The next prime is 78750337. The reversal of 78750313 is 31305787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74097664 + 4652649 = 8608^2 + 2157^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78750313 is a prime.

It is a super-2 number, since 2×78750313² = 12403223595195938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78700313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39375156 + 39375157.

It is an arithmetic number, because the mean of its divisors is an integer number (39375157).

Almost surely, 2^78750313 is an apocalyptic number.

It is an amenable number.

78750313 is a deficient number, since it is larger than the sum of its proper divisors (1).

78750313 is an equidigital number, since it uses as much as digits as its factorization.

78750313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 78750313 is about 8874.1373101840. The cubic root of 78750313 is about 428.6315119942.

The spelling of 78750313 in words is "seventy-eight million, seven hundred fifty thousand, three hundred thirteen".