78135373 has 2 divisors, whose sum is σ = 78135374. Its totient is φ = 78135372.

The previous prime is 78135371. The next prime is 78135377. The reversal of 78135373 is 37353187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76702564 + 1432809 = 8758^2 + 1197^2 .

It is a cyclic number.

It is not a de Polignac number, because 78135373 - 2¹ = 78135371 is a prime.

It is a super-2 number, since 2×78135373² = 12210273027698258, which contains 22 as substring.

Together with 78135371, 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 (78135371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39067686 + 39067687.

It is an arithmetic number, because the mean of its divisors is an integer number (39067687).

Almost surely, 2^78135373 is an apocalyptic number.

It is an amenable number.

78135373 is a deficient number, since it is larger than the sum of its proper divisors (1).

78135373 is an equidigital number, since it uses as much as digits as its factorization.

78135373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 37.

The square root of 78135373 is about 8839.4215308469. The cubic root of 78135373 is about 427.5129059177.

The spelling of 78135373 in words is "seventy-eight million, one hundred thirty-five thousand, three hundred seventy-three".